System Manual
SENTRON
Protection devices
3VL IEC molded case circuit breakers
11/2013Edition
Answers for Infrastructure & Cities.
3VL IEC molded case circuit breakers
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SENTRON
Protection devices
3VL IEC molded case circuit
breakers
System Manual
11/2013
110 0110
- 02 DS 03
About this document
1
Product-specific information
2
Product description
3
Functions
4
Application planning
5
Installing/mounting
6
Connecting
7
Displays and operator
controls
8
Parameter assignment /
addressing
9
Service and maintenance
10
Technical data
11
Dimensional drawings
12
Circuit diagrams
13
Spare parts/accessories
14
Appendix
A
Siemens AG
Industry Sector
Postfach 48 48
90026 NÜRNBERG
GERMANY
Order number: 3ZX1012-0VL10-0AC1
Ⓟ
03/2014 Subject to change
Copyright © Siemens AG 2009.
All rights reserved
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
indicates that minor personal injury can result if proper precautions are not taken.
NOTICE
indicates that property damage can result if proper precautions are not taken.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by
personnel qualified
for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 5
Table of contents
1 About this document ............................................................................................................................. 11
1.1 Introduction .................................................................................................................................. 11
1.2 Technical Support ........................................................................................................................ 11
2 Product-specific information .................................................................................................................. 13
2.1 Important notes ............................................................................................................................ 13
2.2 Ordering data ............................................................................................................................... 15
3 Product description ............................................................................................................................... 17
3.1 Overview 3VL ............................................................................................................................... 17
3.2 Application overview .................................................................................................................... 20
3.3 Configuration ................................................................................................................................ 22
3.3.1 Functional principle ...................................................................................................................... 22
3.3.2 Subdivision according to power ranges ....................................................................................... 22
3.3.3 Thermal-magnetic overcurrent trip units ...................................................................................... 23
3.3.4 Electronic overcurrent trip unit (ETU)........................................................................................... 24
3.4 Mechanical operating mechanisms.............................................................................................. 26
3.4.1 Toggle lever operating mechanism .............................................................................................. 26
3.4.2 Rotary mechanism on front (optional) .......................................................................................... 27
3.4.3 Door-coupling rotary operating mechanism (optional) ................................................................. 29
3.4.4 Side panel rotary operating mechanism (optional) ...................................................................... 30
3.5 Motorized operating mechanisms (optional) ................................................................................ 32
3.5.1 Motorized operating mechanism with stored energy mechanism (SEO)..................................... 33
3.5.2 Motorized operating mechanism (MO) ........................................................................................ 34
4 Functions .............................................................................................................................................. 35
4.1 Protection functions ..................................................................................................................... 35
4.1.1 Overcurrent release ..................................................................................................................... 35
4.1.2 Function overview of the overcurrent release .............................................................................. 36
4.1.3 Setting options of the overcurrent release ................................................................................... 38
4.1.4 General technical data of the overcurrent release ....................................................................... 40
4.1.5 Differential current protection with RCD module .......................................................................... 44
4.1.6 Single-pole operation with RCD module ...................................................................................... 48
4.1.7 Ground-fault protection ................................................................................................................ 49
4.2 Internal accessories ..................................................................................................................... 51
4.2.1 Possible complements for the insulated accessory compartments ............................................. 51
4.2.2 Undervoltage release ................................................................................................................... 52
4.2.3 Shunt release ............................................................................................................................... 53
4.2.4 Auxiliary switches and alarm switches ......................................................................................... 54
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3VL IEC molded case circuit breakers
6 System Manual, 11/2013, 110 0110 - 02 DS 03
5 Application planning .............................................................................................................................. 57
5.1 Use with frequency converters .................................................................................................... 57
5.2 Use of capacitor banks ................................................................................................................ 58
5.3 Transformer protection on the primary side ................................................................................ 59
5.4 Use in DC systems ...................................................................................................................... 60
5.5 Use in IT systems ........................................................................................................................ 62
5.6 Use in motor protection ............................................................................................................... 64
5.7 Use in unusual environments: ..................................................................................................... 67
5.8 Use in series connection ............................................................................................................. 69
5.9 Use in transfer control system .................................................................................................... 71
5.10 Use in communication environment ............................................................................................ 74
6 Installing/mounting ................................................................................................................................ 77
6.1 Installation methods .................................................................................................................... 77
6.2 Mounting and safety clearances ................................................................................................. 80
6.3 Locking devices ........................................................................................................................... 84
6.3.1 Locking devices for a padlock ..................................................................................................... 84
6.3.2 Locking device with a safety lock ................................................................................................ 86
6.3.3 Mutual interlocking of two molded case circuit breakers ............................................................ 86
7 Connecting ........................................................................................................................................... 89
7.1 Cables and busbars .................................................................................................................... 89
7.2 Main connection types for fixed mounting ................................................................................... 99
7.3 Main connection methods for plug-in and withdrawable version .............................................. 106
8 Displays and operator controls ............................................................................................................. 109
8.1 Overcurrent trip unit without LCD display ................................................................................. 109
8.2 Overcurrent trip unit with LCD display ...................................................................................... 114
9 Parameter assignment / addressing ..................................................................................................... 119
9.1 Setting the parameters .............................................................................................................. 119
9.2 Setting the protection parameters for motor protection (ETU10M, ETU30M and LCD-ETU
40M) .......................................................................................................................................... 123
10 Service and maintenance ..................................................................................................................... 125
10.1 Preventive measures ................................................................................................................ 125
10.2 Troubleshooting ........................................................................................................................ 127
11 Technical data ..................................................................................................................................... 129
11.1 General data - 3VL molded case circuit breakers ..................................................................... 129
11.2 Technical overview .................................................................................................................... 132
11.3 Configuration of main connections ............................................................................................ 136
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System Manual, 11/2013, 110 0110 - 02 DS 03 7
11.4 Derating factors .......................................................................................................................... 142
11.4.1 Use at altitudes above 2000 meters .......................................................................................... 142
11.4.2 Use under diverse ambient temperatures .................................................................................. 143
11.5 Power loss .................................................................................................................................. 150
11.6 Capacitor banks ......................................................................................................................... 152
11.7 Motor Protection ......................................................................................................................... 153
11.8 Motorized operating mechanisms .............................................................................................. 156
11.9 RCD modules ............................................................................................................................. 158
11.10 Undervoltage release ................................................................................................................. 159
11.11 Time-delay device for undervoltage releases ............................................................................ 160
11.12 Shunt release ............................................................................................................................. 161
11.13 Auxiliary switches and alarm switches ....................................................................................... 163
11.14 Position signaling switch ............................................................................................................ 164
11.15 Leading auxiliary switches in front-operated rotary operating mechanism ................................ 166
11.16 Ground-fault detection ............................................................................................................... 166
11.17 IP degrees of protection ............................................................................................................. 167
12 Dimensional drawings ......................................................................................................................... 169
12.1 VL160X (3VL1), VL160 (3VL2), and VL250 (3VL3), 3- and 4-pole, to 250 A ............................ 169
12.1.1 Molded case circuit breakers ..................................................................................................... 169
12.1.2 Operating mechanisms .............................................................................................................. 171
12.1.3 Connections and phase barriers ................................................................................................ 174
12.1.4 Terminal covers.......................................................................................................................... 176
12.1.5 Locking device for the toggle lever ............................................................................................ 177
12.1.6 Rear interlocking module ........................................................................................................... 177
12.1.7 Accessories ................................................................................................................................ 178
12.1.8 Door cutouts ............................................................................................................................... 179
12.1.9 Plug-in base and accessories .................................................................................................... 181
12.1.10 VL160X (3VL1), 3- and 4-pole, up to 160 A ............................................................................... 183
12.1.10.1 Plug-in base and accessories ............................................................................................... 183
12.1.11 VL160 (3VL) and VL250 (3VL3), 3- and 4-pole, up to 250 A ..................................................... 185
12.1.11.1 Withdrawable version and accessories ................................................................................ 185
12.2 VL400 (3VL4), 3- and 4-pole, up to 400 A ................................................................................. 189
12.2.1 Molded case circuit breakers ..................................................................................................... 189
12.2.2 Operating mechanisms .............................................................................................................. 190
12.2.3 Connections and phase barriers ................................................................................................ 194
12.2.4 Terminal covers.......................................................................................................................... 195
12.2.5 Rear interlocking module ........................................................................................................... 196
12.2.6 Locking devices, locking device for toggle lever and accessories ............................................. 196
12.2.7 Door cutouts ............................................................................................................................... 198
12.2.8 Plug-in base and accessories ....................................................................................................
200
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3VL IEC molded case circuit breakers
8 System Manual, 11/2013, 110 0110 - 02 DS 03
12.3 VL630 (3VL5), 3- and 4-pole, up to 630 A ................................................................................ 206
12.3.1 Molded case circuit breakers .................................................................................................... 206
12.3.2 Operating mechanisms ............................................................................................................. 207
12.3.3 Connections and phase barriers ............................................................................................... 210
12.3.4 Terminal covers ......................................................................................................................... 211
12.3.5 Rear interlocking module .......................................................................................................... 212
12.3.6 Locking and locking device for toggle lever .............................................................................. 213
12.3.7 Accessories ............................................................................................................................... 213
12.3.8 Door cutouts .............................................................................................................................. 214
12.3.9 Plug-in base and accessories ................................................................................................... 216
12.3.10 Withdrawable version and accessories ..................................................................................... 218
12.4 VL800 (3VL6), 3- and 4-pole, up to 800 A ................................................................................ 222
12.4.1 Molded case circuit breakers .................................................................................................... 222
12.4.2 Operating mechanisms ............................................................................................................. 223
12.4.3 Withdrawable version ................................................................................................................ 225
12.4.4 Connections and phase barriers ............................................................................................... 230
12.4.5 Terminal covers ......................................................................................................................... 231
12.4.6 Locking and locking device for toggle lever .............................................................................. 232
12.4.7 Rear interlocking module .......................................................................................................... 233
12.4.8 Accessories ............................................................................................................................... 234
12.4.9 Door cutouts .............................................................................................................................. 235
12.5 VL1250 (3VL7) and VL1600 (3VL8), 3- and 4-pole, up to 1600 A ............................................ 237
12.5.1 Molded case circuit breakers .................................................................................................... 237
12.5.2 Operating mechanisms ............................................................................................................. 238
12.5.3 Withdrawable version ................................................................................................................ 240
12.5.4 Connections and phase barriers ............................................................................................... 244
12.5.5 Terminal covers ......................................................................................................................... 245
12.5.6 Rear interlocking module .......................................................................................................... 248
12.5.7 Locking and locking device for toggle lever .............................................................................. 249
12.5.8 Accessories ............................................................................................................................... 249
12.5.9 Door cutouts .............................................................................................................................. 250
12.5.10 Current transformer ................................................................................................................... 251
12.6 Interlocks for VL160X (3VL1) to VL800 (3VL6), 3- and 4-pole, up to 800 A ............................. 252
12.6.1 Locking with bowden wire ......................................................................................................... 252
12.7 VL160X (3VL1) with RCD block, 3- and 4-pole, up to 160 A .................................................... 253
12.7.1 Molded case circuit breakers .................................................................................................... 253
12.7.2 Connections and phase barriers ............................................................................................... 254
12.7.3 Terminal covers ......................................................................................................................... 256
12.7.4 Door cutouts .............................................................................................................................. 257
12.7.5 Plug-in base and accessories ................................................................................................... 260
12.8 VL160 (3VL2) and VL250 (3VL3) with RCD module, 3- and 4-pole, to 250 A .......................... 262
12.8.1 Molded case circuit breakers .................................................................................................... 262
12.8.2 Connections and phase barriers ............................................................................................... 263
12.8.3 Terminal covers ......................................................................................................................... 265
12.8.4 Door cutouts .............................................................................................................................. 267
12.8.5 Plug-in base and accessories ................................................................................................... 269
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3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 9
12.9 VL400 (3VL4) with RCD module, 3- and 4-pole, up to 400 A .................................................... 275
12.9.1 Molded case circuit breakers ..................................................................................................... 275
12.9.2 VL400 (3VL4) molded case circuit breaker with RCD front connection bar (connections
and interphase barriers) ............................................................................................................. 277
12.9.3 Terminal covers.......................................................................................................................... 279
12.9.4 Door cutouts ............................................................................................................................... 281
12.9.5 Plug-in base and accessories .................................................................................................... 283
12.10 Door-coupling rotary operating mechanisms 8UC ..................................................................... 288
12.11 4NC current transformers for measuring purposes ................................................................... 291
12.12 COM20/COM21 (communication module for SENTRON 3VL) ................................................. 292
13 Circuit diagrams .................................................................................................................................. 293
14 Spare parts/accessories ...................................................................................................................... 303
14.1 Installation .................................................................................................................................. 303
A Appendix............................................................................................................................................. 307
A.1 Table of abbreviations ................................................................................................................ 307
A.2 Standards and specifications ..................................................................................................... 308
A.3 Comprehensive support from A to Z .......................................................................................... 310
Index................................................................................................................................................... 313
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 11
About this document
1
1.1
Introduction
Purpose of this manual
This manual is intended for reference purposes. The information in this manual enables you
to configure and operate the SENTRON 3VL system.
Audience
This manual is aimed at people with the required qualifications to commission and operate
the SENTRON 3VL system.
1.2
Technical Support
You can find further support on the Internet at:
Technical Support (http://www.siemens.com/lowvoltage/technical-support)
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 13
Product-specific information
2
2.1
Important notes
Validity
This manual applies to SENTRON molded case circuit breakers with the following
designations:
● VL160X
● VL160
● VL250
● VL400
● VL630
● VL800
● VL1250
● VL1600
Standards and certifications
The 3VL molded case circuit breakers comply with the following regulations:
● IEC 60947-2 / DIN EN 60947-2
● IEC 60947-1 / DIN EN 60947-1
● Isolating features in accordance with IEC 60947-2 / DIN EN 60947-2
● As a network disconnecting device (main control switches) according to EN 60204 and
DIN VDE 0113, and additionally also with the requirements for "disconnecting units with
features for stopping and switching off in an emergency" (EMERGENCY-STOP switches)
in conjunction with lockable rotary operating mechanisms (red-yellow) and terminal
covers. Not in conjunction with motorized operating mechanisms.
Operating conditions
Suitable enclosures must be provided for operation in areas with severe ambient conditions
(such as dust, caustic vapors, hazardous gases).
Product-specific information
2.1 Important notes
3VL IEC molded case circuit breakers
14 System Manual, 11/2013, 110 0110 - 02 DS 03
Disclaimer of liability
The products described here were developed to perform safety-oriented functions as part of
an overall installation or machine. A complete safety-oriented system generally features
sensors, evaluation units, signaling units, and reliable shutdown concepts. It is the
responsibility of the manufacturer to ensure that a system or machine is functioning properly
as a whole. Siemens AG, its regional offices, and associated companies (hereinafter referred
to as "Siemens") cannot guarantee all the properties of a whole plant or machine that has
not been designed by Siemens.
Nor can Siemens assume liability for recommendations that appear or are implied in the
following description. No new guarantee, warranty, or liability claims beyond the scope of the
Siemens general terms of supply are to be derived or inferred from the following description.
See also
Standards and specifications (Page 308)
Product-specific information
2.2 Ordering data
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 15
2.2
Ordering data
Order number scheme
The table below describes the order number scheme according to which all circuit breakers
can be located and combined to suit the individual application:
Figure 2-1 Overview of the order number system
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 17
Product description
3
3.1
Overview 3VL
3VL molded case circuit breakers are climate-proof. They are designed for operation in
enclosed areas. Suitable enclosures must be provided for operation in areas with severe
ambient conditions (such as dust, caustic vapors, hazardous gases).
SENTRON VL types
The type designations of all available molded case circuit breakers are oriented around the
rated current.
Type designation
Maximum rated current (A)
VL160X / 3VL1
160
VL160 / 3VL2
160
VL250 / 3VL3
250
VL400 / 3VL4
400
VL630 / 3VL5
630
VL800 / 3VL6
800
VL1250 / 3VL7
1250
VL1600 / 3VL8
1600
Product description
3.1 Overview 3VL
3VL IEC molded case circuit breakers
18 System Manual, 11/2013, 110 0110 - 02 DS 03
Rating plate and ID number
The figure shows all the operator elements, setting options and names corresponding to the
precise specified use of the molded case circuit breaker.
(1)
Size specification and switching capacity (N, H or L)
(2)
Molded case circuit breaker type
(3)
Indication of switching capacity
(4)
Rating plate
(5)
Accessories ID fields
(6)
Order number
(7)
Overcurrent setting
(8)
In rated current of the molded case circuit breaker
(9)
Overcurrent release type TM (thermal-magnetic)
(10)
Reference temperature
(11)
Short-circuit release / setting
(12)
Test key
(13)
Toggle lever with 3 positions
(14)
Switching capacity
(15)
Standards
(16)
Accessories cover (removable)
Figure 3-1 3VL molded case circuit breakers - labeling and operator controls
Product description
3.1 Overview 3VL
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 19
SENTRON VL accessories
(1)
Withdrawable/plug-in base
(13)
Front-operated rotary operating mechanism
(2)
Side panels of withdrawable unit
(14)
Door-coupling rotary operating mechanism
(3)
Phase barriers
(15)
3VL molded case circuit breaker
(4)
Front connecting bars for increased pole spacing
(16)
Internal accessories
(5)
Straight connecting bars
(17)
Electronic trip unit LCD ETU
(6)
Circular conductor terminal for Al / Cu
(18)
Electronic trip unit with communication function
(7)
Box terminal for Cu
(19)
Thermal/magnetic overcurrent release
(8)
Extended terminal cover
(20)
RCD module
(9)
Standard terminal cover
(21)
Rear terminals - flat and round
(10) Masking/cover frame for door cutout (22) COM20 / 21 communication module to the
PROFIBUS DP / MODBUS RTU
(11) Motorized operating mechanism with stored
energy mechanism (SEO)
(23)
Battery power supply with test function for electronic trip
units (ETUs)
(12)
Motorized operating mechanism (MO)
Figure 3-2 SENTRON VL accessories
Product description
3.2 Application overview
3VL IEC molded case circuit breakers
20 System Manual, 11/2013, 110 0110 - 02 DS 03
3.2
Application overview
The following overview shows the most frequently occurring applications.
Application overview
Application
Type
Description
3- and 4-pole molded case circuit
breakers
VL160X
VL160
VL250
VL400
VL630
VL800
VL125
VL1600
System protection
The releases for system protection are designed to protect cables and
non-motorized loads against overload and short-circuit.
3- and 4-pole molded case circuit
breakers
VL160
VL250
VL400
VL630
VL800
VL125
VL1600
Generator protection
The overload and short-circuit releases can be used for optimized
protection of generators.
3-pole molded case circuit
breakers
VL160
VL250
VL400
VL630
Motor protection
The overload and short-circuit releases are designed for optimal
protection and direct starting of three-phase AC squirrel-cage motors.
The molded case circuit breakers for motor protection have phase-
failure sensitivity and a thermal image that protects the motor against
overheating. The adjustable time lag class enables users to adjust the
overload release to the startup conditions of the motor to be protected.
Product description
3.2 Application overview
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 21
Application
Type
Description
3-pole molded case circuit
breakers
VL160
VL250
VL400
VL630
Starter combination
Starter combinations consist of: molded case circuit breaker + contactor
+ overload relay. The molded case circuit breaker handles short-circuit
protection and the isolating function. The contactor has the task of
switching the load feeder normally. The overload relay handles
overload protection that can be specially matched to the motor. The
molded case circuit breaker for starter combination is therefore
equipped with an adjustable and instantaneous short-circuit release.
3- and 4-pole molded case circuit
breakers
VL160X
VL160
VL250
VL400
VL630
VL800
VL1250
VL1600
Non-automatic air circuit breakers
These molded case circuit breakers are used as incoming circuit
breakers, main switches or isolating switches without overload
protection. They have fixed short-circuit releases so that back-up fuses
are not necessary.
Product description
3.3 Configuration
3VL IEC molded case circuit breakers
22 System Manual, 11/2013, 110 0110 - 02 DS 03
3.3
Configuration
3.3.1
Functional principle
Mechanical design
All 3VL molded case circuit breakers have a trip-free mechanism that ensures the trip
process is not prevented even if the operating mechanism is blocked or manually held in the
"ON" position.
The contacts are opened and closed by a toggle lever positioned in the center. This is
attached to the front side on all molded case circuit breakers.
All 3VL molded case circuit breakers are "joint trip units". This means all contacts open or
close simultaneously when the molded case circuit breaker toggle lever is moved from "OFF"
to "ON" or from "ON" to "OFF", or when the tripping mechanism is activated by an
overcurrent or with the help of the auxiliary trips (shunt release or undervoltage release).
Current limiting
The 3VL molded case circuit breakers are designed on the principle of magnetic repulsion of
the contacts. The contacts open before the expected peak-value of the short-circuit current is
reached. Magnetic repulsion of the contacts very considerably reduces the thermal load I2t
as well as the mechanical load resulting from the impulse short-circuit current IP of the
system components that occur during a short-circuit.
You can find more information in the chapter Use in motor protection (Page 64).
3.3.2
Subdivision according to power ranges
VL160X molded case circuit breakers
The most important components of the VL160X molded case circuit breakers are the three
current paths with the incoming and outgoing terminals. The fixed and movable contacts are
arranged in such a way as to guarantee magnetic repulsion of the contacts. In conjunction
with the arcing chambers, a dynamic impedance is generated that causes current limitation.
This reduces the damaging effects of excessively high values I2t and Ip.
The overcurrent release is a factory-installed thermal-magnetic device. It is equipped with
fixed or adjustable overload releases and a fixed short-circuit release in each pole.
To the right and left of the centrally positioned toggle lever of every SENTRON VL molded
case circuit breaker is a double-insulated accessory compartment for installing auxiliary
switches or alarm switches as well as shunt releases and undervoltage releases.
Product description
3.3 Configuration
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 23
VL160 to VL630 molded case circuit breakers
The arrangement of current paths, contact configuration and switch mechanism of the VL160
to VL630 molded case circuit breakers corresponds to that of the VL160X molded case
circuit breaker. The designs diverge with regard to the overcurrent release.
● The overcurrent releases are available in a thermal-magnetic version and in an electronic
version.
● Thermal-magnetic overcurrent releases are available with adjustable overload releases
and short-circuit releases.
VL800 to VL1600 molded case circuit breakers
The arrangement of the current paths and switch mechanisms is identical to that of the
VL160X to VL630 molded case circuit breakers.
However, the VL800 to VL1600 molded case circuit breakers are only available in the
version with electronic trip unit. As with all electronic trip units for the SENTRON VL molded
case circuit breakers from Siemens, the current transformers (one per phase) are
accommodated within the overcurrent release enclosure.
All 3VL molded case circuit breakers with electronic trip units measure the actual RMS
current. This method is the most accurate way of measuring currents in electrical distribution
systems with extremely high harmonics.
3.3.3
Thermal-magnetic overcurrent trip units
A thermal-magnetic overcurrent release consists of two components - a thermal release for
protecting against overload, and a magnetic release for protecting against short-circuit. Both
release components are series-connected.
Thermal release
The thermal release consists of a temperature-dependent bimetal that heats up as a result of
the flow of current. This means the release is current-dependent. The heating of the bimetal
strip depends on the ambient temperature of the molded case circuit breaker. All current
values specified for 3VL for thermal-magnetic releases refer to an ambient temperature of 40
°C. Where ambient temperatures deviate from this, the values in the tables in the chapter
Use at altitudes above 2000 meters (Page 142) are to be used.
Product description
3.3 Configuration
3VL IEC molded case circuit breakers
24 System Manual, 11/2013, 110 0110 - 02 DS 03
Magnetic release
The magnetic release comprises a yoke mounting through which a current path runs, and a
flap armature that is kept at a distance from the yoke mounting by a tension spring. If a
short-circuit current now flows along the current path, the magnetic field thus generated
causes the flap armature to be moved towards the yoke mounting against the opposite force
of the tension spring. The release time is almost current-independent and instantaneous.
The flap armature releases the switching lock and thus opens the switching contacts before
the short-circuit current can reach its maximum; a current limiting effect is thus achieved.
Immediately after release, the flap armature is moved back to its starting position by the
opposite force of the tension spring.
3.3.4
Electronic overcurrent trip unit (ETU)
Electronic trip units (ETUs)
In contrast to thermal-magnetic releases/trip units (TMTUs) where the overcurrent trip is
caused by a bimetal strip or magnetic release, electronic trip units (ETUs) use electronics
with current transformers. The ETU captures the actual currents and compares them with the
default specifications.
All 3VL molded case circuit breakers with electronic overcurrent trips measure the actual
RMS current (true RMS). This is the most accurate method of measuring.
ETUs are available from the VL160 molded case circuit breaker up to and including the
VL1600. The VL800, VL1250 and VL1600 molded case circuit breakers are only available in
the version with electronic trip unit.
Configuration
The electronic overcurrent tripping system consists of:
● 3 to 4 (3-pole or 4-pole) current transformers that also provide their own power supply.
This means an external auxiliary voltage is not required.
● Evaluation electronics with microprocessor
● Tripping solenoid
In all versions with electronic trip units for the 3VL molded case circuit breakers, the current
transformers are located in the same enclosure as the trip unit. At the output of the electronic
overcurrent tripping module, there is a tripping solenoid that trips the molded case circuit
breaker in the event of an overload or short-circuit. In all electronic trip units, the tripping
solenoid is located within the trip unit, except in the shipbuilding ETUs of sizes VL160 and
VL250. In these ETUs, the tripping solenoid is located in the left accessories compartment.
Power supply
The protection functions of the electronic trip unit are guaranteed without additional auxiliary
voltage. The overcurrent releases are supplied with energy via internal current transformers.
The protection function is set via rotary encoding switches on the ETU or via an LCD display.
Product description
3.3 Configuration
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 25
In the case of an LCD display, the electronic trip unit must be activated. This requires a 3-
phase (3-pole) load current of at least 20% or, in the case of a single-phase (single-pole)
load, 30% of the relevant rated current of the molded case circuit breaker. If this load current
is not available, the necessary auxiliary energy can be supplied via a battery power supply
(order no. 3VL9000-8AP01). With communication-capable, molded case circuit breakers, the
trip unit is powered by means of the COM20 or COM21 module.
Battery supply device
The handheld tester for electronic trip units is used as a local test device for the 3VL molded
case circuit breakers with electronic trip unit, and it can be used as an external voltage
supply for the electronic trip units (ETU and LCD-ETU). The portable battery power supply is
fed by two standard 9 V block batteries.
Test function:
● Test tripping
Figure 3-3 Battery supply device
4-pole molded case circuit breakers
The four-pole molded case circuit breakers for system protection can be supplied in all
4 poles with or without current transformers. The trip units in the 4th pole (N) can be set to
50% or 100% of the current in the 3 main current paths dependent on the size, so that safe
protection of the neutral conductor can be guaranteed even with a reduced cross-section. In
the case of LCD-ETUs, the neutral conductor protection can be adjusted in steps from 50%
to 100% or switched off.
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
26 System Manual, 11/2013, 110 0110 - 02 DS 03
3.4
Mechanical operating mechanisms
3.4.1
Toggle lever operating mechanism
In the basic version, the 3VL molded case circuit breakers have a toggle lever as actuator,
which is also an indicator of the switching position. The "Tripped" position is also displayed in
addition to the "ON" and "OFF" positions.
The toggle lever goes to the "tripped" position when the internal trip mechanism is activated
by an overcurrent situation, e.g. overload or short-circuit, or if the Test key is operated.
Activation by an undervoltage release or shunt release will also cause the toggle lever to
move to the "Tripped" position.
The toggle lever must be returned to the "OFF/RESET" position before the molded case
circuit breaker can be activated again. This enables the internal release mechanism to be
reset. 3VL molded case circuit breakers with toggle lever operation comply with the "Network
disconnecting device" condition (5.3.2 Section c) and 5.3.3) according to DIN EN 60204-1
(VDE 0113-1) in conjunction with a locking device.
Toggle lever positions
OFF
RESET
Tripped
Toggle lever positions
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 27
Toggle lever extension
Toggle lever extensions enable user-friendly operation of the molded case circuit breaker
toggle lever.
● VL160X to VL250: toggle lever extension not necessary / not available
● VL400 to VL800: possible as option
● VL1250 to VL1600: included in the scope of supply / optional installation
Toggle lever extension
Use of toggle lever extension
3.4.2
Rotary mechanism on front (optional)
The front-operated rotary operating mechanism converts the vertical movement of the toggle
lever into rotary motion. The molded case circuit breaker is switched on/off or tripped with
the help of the front-operated rotary operating mechanism. The rotary motion on the
switching knob is converted to vertical motion on the toggle lever.
Rotary mechanism
The front
-operated rotary operating mechanism is mounted directly
on the molded case circuit breaker. 3VL
molded case circuit
breakers with rotary mechanism comply with the "Network
disconnecting device" conditi
on of DIN EN 60204-1 (DIN VDE 0113
-
1).
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
28 System Manual, 11/2013, 110 0110 - 02 DS 03
Degree of protection
The front-operated rotary operating mechanism has degree of protection IP30.
Interlocking
Lockable in the "OFF" position with up to 3 padlocks.
A safety lock can also be used.
Application
Standard application:
● Black knob
● Gray indicator plate
Network disconnecting device with features for stopping and shutting down in an emergency:
● Red knob
● Yellow indicator plate
Accessories
Optionally, up to 4 changeover contacts can be used. Two contacts can be used as leading
NO contacts and two contacts as leading NC contacts. These are equipped with 1.5 m long
connection cables.
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 29
3.4.3
Door-coupling rotary operating mechanism (optional)
The door-coupling rotary operating mechanism is available for installation in control cabinets
and distribution boards.
Door
-coupling rotary operating
mechanism
3VL
molded case circuit breakers with door-coupling rotary
mechanism comply with the "Network disconnecting
device" con
dition of DIN EN 60204-1 (DIN VDE 0113-1)
The door-coupling rotary operating mechanism is designed as follows:
● Rotary mechanism on the front with shaft stub (without knob)
● Shaft coupling
● 300 mm extension shaft (600 mm optional, retaining bracket required)
● Actuator
Degree of protection
This mechanism offers degree of protection IP65.
Interlocking
Lockable in the "OFF" position with up to 3 padlocks. A safety lock can also be used.
Application
Standard application:
● Black knob
● Gray indicator plate
Network disconnecting device with features for stopping and shutting down in an emergency:
● Red knob
● Yellow indicator plate
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
30 System Manual, 11/2013, 110 0110 - 02 DS 03
Accessories
Leading auxiliary switches when switching ON and OFF
The leading auxiliary switches (changeover switches) are available as accessories for front-
operated rotary operating mechanisms and door-coupling rotary operating mechanisms.
The following applications are possible:
● Leading auxiliary switch for switching from "ON" to "OFF"
● Leading auxiliary switch for switching from "OFF" to "ON"
Each version, leading auxiliary switch for switching on and off, can be equipped with one or
two changeover switches. The connecting cables of the auxiliary switches are 1.5 m long.
Figure 3-4 Rotary operating mechanism with leading auxiliary switches
3.4.4
Side panel rotary operating mechanism (optional)
The side panel rotary operating mechanism is available for installation in control cabinets
and distribution boards.
Product description
3.4 Mechanical operating mechanisms
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 31
Interlocking
Lockable in the "OFF" position with up to 3 padlocks.
Figure 3-5 Side panel rotary operating mechanism
The side panel rotary operating mechanism is structured as follows:
● Rotary mechanism on the front with shaft stub (without knob)
● Bowden wire operation on the switch
● 2 Bowden wires
● Bowden wire operation for panel-mounting (side panel of the distribution board)
● Actuator
Product description
3.5 Motorized operating mechanisms (optional)
3VL IEC molded case circuit breakers
32 System Manual, 11/2013, 110 0110 - 02 DS 03
Application
Standard application:
● Black knob
● Gray indicator plate
Network disconnecting device with features for stopping and shutting down in an emergency:
● Red knob
● Yellow indicator plate
Accessories
Leading auxiliary switches when switching ON and OFF
The leading auxiliary switches (changeover switches) are available as accessories for side
panel rotary operating mechanisms.
The following applications are possible:
● Leading auxiliary switch for switching from "ON" to "OFF"
● Leading auxiliary switch for switching from "OFF" to "ON"
Each version, leading auxiliary switch for switching on and off, can be equipped with one or
two changeover switches. The connecting cables of the auxiliary switches are 1.5 m long.
3.5
Motorized operating mechanisms (optional)
Motorized operating mechanisms enable the molded case circuit breaker to be switched
on/off locally or by remote control. For electrical and mechanical locking of the operating
mechanism, they are equipped as standard with a locking device for padlocks.
The motorized operating mechanism with stored energy mechanism (SEO) can be optionally
equipped with a cylinder lock for locking in the OFF position.
Motorized operating mechanisms can also be actuated manually. Two types of mechanisms
are offered.
Note
molded
case circuit breakers with motorized operating mechanisms
cannot
be used as
network disconnecting devices in accordance with DIN
EN 60204-1 (VDE 0113-1).
Product description
3.5 Motorized operating mechanisms (optional)
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 33
3.5.1
Motorized operating mechanism with stored energy mechanism (SEO)
SEO for VL160X-VL800
● The motorized operating mechanism with stored energy mechanism (SEO) is suitable for
synchronization tasks.
● The motor charges a motorized operating mechanism with stored energy mechanism and
moves the SENTRON VL toggle lever to the "OFF/RESET" position.
● The motorized operating mechanism with stored energy operate discharges when
actuated, quickly switching the SENTRON VL toggle lever to the "ON" position.
● A mode switch allows local (Manual) or remote (Auto) operation to be selected.
● The manual actuator handle is located on the front of the operating mechanism cover.
Figure 3-6 Motorized operating mechanism with stored energy mechanism
Product description
3.5 Motorized operating mechanisms (optional)
3VL IEC molded case circuit breakers
34 System Manual, 11/2013, 110 0110 - 02 DS 03
3.5.2
Motorized operating mechanism (MO)
Motorized operating mechanism for VL160x-VL1600
The motorized operating mechanism (MO) is required for remote switching of molded case
circuit breakers. Thanks to its fast break time, it is perfectly suited to transfer control
systems.
The integrated switch position indicator of the motorized operating mechanism (MO)
indicates the ON, OFF and TRIP states.
The LOCAL, MANUAL or AUTO modes can be selected with the mode switch:
LOCAL
Operation using pushbuttons on-site
MANUAL
Manual operation with the help of an A
llen key on the front of the motorized
operating mechanism (MO)
AUTO
Remote control via control wire
Note
The Allen key for manual operation is located on the front of the device.
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 35
Functions
4
4.1
Protection functions
4.1.1
Overcurrent release
The 3VL molded case circuit breakers are designed on the principle of magnetic repulsion of
the contacts. The contacts open before the expected peak-value of the short-circuit current is
reached. Magnetic repulsion of the contacts very considerably reduces the thermal load I2t
as well as the mechanical load resulting from the impulse short-circuit current Ip of the
system components that occur during a short-circuit.
(1)
Main connections
(2)
Breaker mechanism
(3)
Overcurrent release
(4)
Movable contact arm
(5)
Arc chute
(6)
Enclosure
Figure 4-1 Interior view MCCB
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
36 System Manual, 11/2013, 110 0110 - 02 DS 03
4.1.2
Function overview of the overcurrent release
VL160 to VL1600
Table 4- 1 Meaning of symbols
✓
Function available
—
Function not available
Table 4- 2 Function overview
Order No.
supplement
Releases
System
protection
System /
generator
protection
Motor
protection
Starter
protection
Non-automatic
circuit breakers
Function
Release type
DK
M
—
—
—
✓
—
I
DE
M
—
—
—
—
✓
I
EE
M
—
—
—
—
✓
I
DA
TM
2)
✓
—
—
—
—
LI
DD
TM
2)
✓
—
—
—
—
LI
DC
TM
2)
✓
—
—
—
—
LI
EH
TM
2)
✓
—
—
—
—
LI
EJ
TM
2)
✓
—
—
—
—
LI
EA
TM
2)
✓
—
—
—
—
LIN
EC
TM
2)
✓
—
—
—
—
LIN
EM
TM
2)
✓
—
—
—
—
LIN
SP
ETU10M
3)
—
—
✓
—
—
LI
MP
ETU10M
3)
—
—
✓
—
—
LI
SB
ETU10
✓
—
—
—
—
LI
MB
ETU10
✓
—
—
—
—
LI
LB
ETU10
✓
—
—
—
—
LI
TA
ETU10
✓
—
—
—
—
LIN
NA ETU10 ✓ — — — — LIN
LA
ETU10
✓
—
—
—
—
LIN
TB
ETU10
✓
—
—
—
—
LI
NB
ETU10
✓
—
—
—
—
LI
SL
ETU12
✓
—
—
—
—
LIG
ML
ETU12
✓
—
—
—
—
LIG
SF
ETU12
✓
—
—
—
—
LIG
MF
ETU12
✓
—
—
—
—
LIG
TN
ETU12
✓
—
—
—
—
LING
NN
ETU12
✓
—
—
—
—
LING
SE
ETU20
—
✓
—
—
—
LSI
ME
ETU20
—
✓
—
—
—
LSI
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 37
Order No.
supplement
Releases
System
protection
System /
generator
protection
Motor
protection
Starter
protection
Non-automatic
circuit breakers
Function
Release type
LE
ETU20
—
✓
—
—
—
LSI
TE
ETU20
—
✓
—
—
—
LSI
NE
ETU20
—
✓
—
—
—
LSI
TF
ETU20
—
✓
—
—
—
LSIN
NF
ETU20
—
✓
—
—
—
LSIN
LF
ETU20
—
✓
—
—
—
LSIN
SG
ETU22
—
✓
—
—
—
LSIG
MG
ETU22
—
✓
—
—
—
LSIG
SH
ETU22
—
✓
—
—
—
LSIG
MH
ETU22
—
✓
—
—
—
LSIG
TH
ETU22
—
✓
—
—
—
LSING
NH
ETU22
—
✓
—
—
—
LSING
SS
ETU30M
3)
—
—
✓
—
—
LI
MS
ETU30M
3)
—
—
✓
—
—
LI
LS
ETU30M
3)
—
—
✓
—
—
LI
UP
LCD-ETU40M
3)
—
—
✓
—
—
LI
UH LCD-ETU40 — ✓ — — — LI, LS, LSI
UJ
LCD-ETU40
—
✓
—
—
—
LI, LSI, LIN, LSIN
UL LCD-ETU42 — ✓ — — — LSIG
UM
LCD-ETU42
—
✓
—
—
—
LSIG
UN
LCD-ETU42
—
✓
—
—
—
LSIG, LSING
1)
Size dependent
2)
TM to In = 630 A
3)
Motor protection to In = 500 A
L: Long time delay
S: Short time delay
I: Instantaneous
N: Neutral protection
G: Ground fault
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
38 System Manual, 11/2013, 110 0110 - 02 DS 03
4.1.3
Setting options of the overcurrent release
VL160 to VL1600
In view of the large number of setting options of the individual overcurrent releases, an
overview in table form is useful for calculating the optimal operating point.
Table 4- 3 Overcurrent tripping method - setting options
Order No.
supplement
Releases
Setting options
L
S1)
I1)
G
Overload
protection
Short-circuit protection
(short-time delayed)
Short-circuit
protection
(instantaneous)
Ground-fault protection
Ir = x In
Isd = x Ir
tsd [s]
Ii = x In
Ig = In
tg [s]
DK
M
5)
—
—
—
7 ... 15
—
—
DE
M
5)
—
—
—
8 … 18
—
—
EE
M
5)
—
—
—
8 … 18
—
—
DA
TM
2)5)
1
—
—
9 … 18
4)
—
—
DD
TM
2)5)
0,8 ... 1
—
—
9 … 18
4)
—
—
DC
TM
2)5)
0,8 ... 1
—
—
5 ... 10
—
—
EH
TM
2)5)
1
—
—
9 … 18
4)
—
—
EJ
TM
2)5)
0,8 ... 1
—
—
5 ... 10
—
—
EA
TM
2)5)
1
—
—
9 … 18
4)
—
—
EC
TM
2)5)
0,8 ... 1
—
—
5 ... 10
—
—
EM
TM
2)5)
0,8 ... 1
—
—
5 ... 10
—
—
SP
ETU10M
3)
0,4 ... 1
—
—
1,25 ... 11
—
—
MP
ETU10M
3)
0,4 ... 1
—
—
1,25 ... 11
—
—
SB
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
MB
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
LB
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
TA
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
NA ETU10 0,4 ... 1 — — 1,25 ... 11 — —
LA
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
TB
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
NB
ETU10
0,4 ... 1
—
—
1,25 ... 11
—
—
SL
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
ML
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
SF
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
MF
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
TN
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
NN
ETU12
0,4 ... 1
—
—
1,25 ... 11
0.6 ... 1, OFF
0,1 … 0,3
SE
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
ME
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 39
Order No.
supplement
Releases
Setting options
L
S1)
I1)
G
Overload
protection
Short-circuit protection
(short-time delayed)
Short-circuit
protection
(instantaneous)
Ground-fault protection
Ir = x In
Isd = x Ir
tsd [s]
Ii = x In
Ig = In
tg [s]
LE
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
TE
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
NE
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
TF
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
NF
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
LF
ETU20
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
—
—
SG
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
MG
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
SH
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
MH
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
TH
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
NH
ETU22
0,4 ... 1
1,5 ... 10
0 ... 0,5
11
0.6 ... 1, OFF
0,1 … 0,3
SS
ETU30M
3)
0,4 ... 1
—
—
06.08.2011
—
—
MS
ETU30M
3)
0,4 ... 1
—
—
06.08.2011
—
—
LS
ETU30M
3)
0,4 ... 1
—
—
06.08.2011
—
—
UP
LCD-ETU40M
3)
0,4 ... 1
—
—
1,25 ... 11
—
—
UH
LCD-ETU40
0,4 ... 1
1,5 ... 10
0 ... 0,5
1,25 ... 11
—
—
UJ LCD-ETU40 0,4 ... 1 1,5 ... 10 0 ... 0,5 1,25 ... 11 — —
UL
LCD-ETU42
0,4 ... 1
1,5 ... 10
0 ... 0,5
1,25 ... 11
0,4 ... 1
0,1 ... 0,5
UM
LCD-ETU42
0,4 ... 1
1,5 ... 10
0 ... 0,5
1,25 ... 11
0,4 ... 1
0,1 ... 0,5
UN
LCD-ETU42
0,4 ... 1
1,5 ... 10
0 ... 0,5
1,25 ... 11
0,4 ... 1
0,1 ... 0,5
1) Size dependent
2) TM to In = 630 A
3) Motor protection to In = 500 A
4) Fixed
5) With single-pole load, tripping occurs at 130% of the set instantaneous short-circuit
current.
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
40 System Manual, 11/2013, 110 0110 - 02 DS 03
4.1.4
General technical data of the overcurrent release
VL160 to VL1600
Table 4- 4 Meaning of symbols
✓
Function available
—
Function not available
Order No.
supplement
Releases
Thermal
image
Phase
failure
Communication
capability
4)
Ground-
fault
protection
Number of
poles
N pole
protected
1)
DK
M
—
—
—
—
3
—
DE
M
—
—
—
—
3
—
EE
M
—
—
—
—
4
—
DA
TM
2)
✓
—
—
—
3
—
DD
TM
2)
✓
—
—
—
3
—
DC
TM
2)
✓
—
—
—
3
—
EH
TM
2)
✓
—
—
—
4
—
EJ
TM
2)
✓
—
—
—
4
—
EA
TM
2)
✓
—
—
—
4
100 %
EC
TM
2)
✓
—
—
—
4
60 %
EM
TM
2)
✓
—
—
—
4
100 %
SP ETU10M 3) ✓ 40% IR — — 3 —
MP
ETU10M
3)
✓
40% I
R
✓
—
3
—
SB ETU10 ✓ — — — 3 —
MB
ETU10
✓
—
✓
—
3
—
LB
ETU10
✓
—
—
—
3
—
TA
ETU10
✓
—
—
—
4
50 / 100 %
NA
ETU10
✓
—
✓
—
4
50 / 100 %
LA
ETU10
✓
—
—
—
4
50 / 100 %
TB
ETU10
✓
—
—
—
4
—
NB
ETU10
✓
—
✓
—
4
—
SL ETU12 ✓ — —
①
3 —
ML ETU12 ✓ — ✓
①
3 —
SF ETU12 ✓ — —
②
3 —
MF ETU12 ✓ — ✓
②
3 —
TN ETU12 ✓ — —
②
4 50 / 100 %
NN ETU12 ✓ — ✓
②
4 50 / 100 %
SE
ETU20
✓
—
—
—
3
—
ME
ETU20
✓
—
✓
—
3
—
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 41
LE
ETU20
✓
—
—
—
3
—
TE
ETU20
✓
—
—
—
4
—
NE
ETU20
✓
—
✓
—
4
—
TF
ETU20
✓
—
—
—
4
50 / 100 %
NF
ETU20
✓
—
✓
—
4
50 / 100 %
LF
ETU20
✓
—
—
—
4
50 / 100 %
SG ETU22 ✓ -— —
①
3 —
MG ETU22 ✓ — ✓
①
3 —
SH ETU22 ✓ — —
②
3 —
MH ETU22 ✓ — ✓
②
3 —
TH ETU22 ✓ — — ② 4 50 / 100 %
NH ETU22 ✓ — ✓
②
4 50 / 100 %
SS
ETU30M
3)
✓
40% IR
—
—
3
—
MS
ETU30M
3)
✓
40% I
R
✓
—
3
—
LS
ETU30M
3)
✓
40% I
R
—
—
3
—
UP
LCD-ETU40M
3)
✓
5 to 50% IR
✓
—
3
—
UH
LCD-ETU40
✓
—
✓
—
3
—
UJ LCD-ETU40 ✓ — ✓ — 4 50 … 100%, OFF
UL LCD-ETU42 ✓ — ✓
①
3 —
UM LCD-ETU42 ✓ — ✓
①
/
③
3 —
UN LCD-ETU42 ✓ — ✓
②
4 50 … 100%, OFF
1)
Size dependent
2)
TM to In = 630 A
3)
Motor protection to In = 500 A
4) With COM20/COM21
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
42 System Manual, 11/2013, 110 0110 - 02 DS 03
Further information on ①, ② and ③
Further information for ①, ② and ③ can be found in chapter:
Ground-fault protection (Page 49)
Table 4- 5 Image references for ①, ② and ③
No.
Meaning
Information in image
① Vectorial summation current formation
(3-conductor system)
• "Molded case circuit breaker in balanced systems"
② Vectorial summation current formation
(4-conductor system)
• "3-
pole molded case circuit breaker, current transformer in neutral
conductor current"
• "4-pole molded case circuit breaker, current transformer installed
internally"
③ Direct recording of the ground-fault current
at the neutral point of the transformer
• "3-pole molded case circuit breaker, current transformer at the
grounded neutral point of the transformer"
Table 4- 6 General data II
Order No.
supplement
Releases
I2t
(ON/OFF)
Trip class (tC)
Time-lag
class (tR)
Thermal-
magnetic
release
Magnetic
release
Electronic
trip unit
LCD
display
DK
M
—
—
—
—
✓
—
—
DE
M
—
—
—
—
✓
—
—
EE
M
—
—
—
—
✓
—
—
DA
TM
2)
—
—
—
✓
—
—
—
DD
TM
2)
—
—
—
✓
—
—
—
DC
TM
2)
—
—
—
✓
—
—
—
EH
TM
2)
—
—
—
✓
—
—
—
EJ
TM
2)
—
—
—
✓
—
—
—
EA
TM
2)
—
—
—
✓
—
—
—
EC
TM
2)
—
—
—
✓
—
—
—
EM
TM
2)
—
—
—
✓
—
—
—
SP
ETU10M
3)
—
10
—
—
—
✓
—
MP
ETU10M
3)
—
10
—
—
—
✓
—
SB ETU10 — — 2.5 ... 30 — — ✓ —
MB
ETU10
—
—
2.5 ... 30
—
—
✓
—
LB
ETU10
—
—
2.5 ... 30
—
—
✓
—
TA
ETU10
—
—
2.5 ... 30
—
—
✓
—
NA
ETU10
—
—
2.5 ... 30
—
—
✓
—
LA
ETU10
—
—
2.5 ... 30
—
—
✓
—
TB
ETU10
—
—
2.5 ... 30
—
—
✓
—
NB
ETU10
—
—
2.5 ... 30
—
—
✓
—
SL
ETU12
—
—
2.5 ... 30
—
—
✓
—
ML
ETU12
—
—
2.5 ... 30
—
—
✓
—
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 43
Order No.
supplement
Releases
I2t
(ON/OFF)
Trip class (tC)
Time-lag
class (tR)
Thermal-
magnetic
release
Magnetic
release
Electronic
trip unit
LCD
display
SF
ETU12
—
—
2.5 ... 30
—
—
✓
—
MF
ETU12
—
—
2.5 ... 30
—
—
✓
—
TN
ETU12
—
—
2.5 ... 30
—
—
✓
—
NN
ETU12
—
—
2.5 ... 30
—
—
✓
—
SE
ETU20
✓
—
—
—
—
✓
—
ME
ETU20
✓
—
—
—
—
✓
—
LE
ETU20
✓
—
—
—
—
✓
—
TE
ETU20
✓
—
—
—
—
✓
—
NE
ETU20
✓
—
—
—
—
✓
—
TF
ETU20
✓
—
—
—
—
✓
—
NF
ETU20
✓
—
—
—
—
✓
—
LF
ETU20
✓
—
—
—
—
✓
—
SG
ETU22
✓
—
—
—
—
✓
—
MG
ETU22
✓
—
—
—
—
✓
—
SH
ETU22
✓
—
—
—
—
✓
—
MH
ETU22
✓
—
—
—
—
✓
—
TH ETU22 ✓ — — — — ✓ —
NH
ETU22
✓
—
—
—
—
✓
—
SS ETU30M 3) — 10, 20, 30 — — ✓ —
MS
ETU30M
3)
—
10, 20, 30
—
—
—
✓
—
LS
ETU30M
3)
—
10, 20, 30
—
—
—
✓
—
UP
LCD-ETU40M
3)
—
5, 10, 15, 20, 30
—
—
—
✓
✓
UH
LCD-ETU40
✓
—
2.5 ... 30
—
—
✓
✓
UJ
LCD-ETU40
✓
—
2.5 ... 30
—
—
✓
✓
UL
LCD-ETU42
✓
—
2.5 ... 30
—
—
✓
✓
UM
LCD-ETU42
✓
—
2.5 ... 30
—
—
✓
✓
UN
LCD-ETU42
✓
—
2.5 ... 30
—
—
✓
✓
2)
TM to In = 630 A
3) Motor protection to In = 500 A
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
44 System Manual, 11/2013, 110 0110 - 02 DS 03
4.1.5
Differential current protection with RCD module
The molded case circuit breaker with differential current protection is very often used to implement a
double function:
● Protection of systems against overload and short-circuit currents.
● Protection of cables and electrical equipment against damage from ground faults.
The SENTRON VL RCD modules are offered as accessories for the VL160X, VL160, VL250
and VL400 molded case circuit breakers with thermal-magnetic overcurrent releases. This
combination is called molded case circuit breaker with differential current protection of
type A. Type A means tripping is guaranteed both in the case of faults in sinusoidal
alternating currents and in the case of faults in pulsating direct currents. These units have an
adjustable trip time delay ∆t. The values for the rated fault current I∆n can also be adjusted.
In a fault-free system, the sum of the currents in the summation current transformer of the
RCD module is zero. A ground fault current occurring in the circuit as the result of an
insulation fault produces a differential current that induces a voltage in the secondary
winding of the current transformer. The evaluation electronics monitors the induced voltage
and transmit a trip command to the RCD trip unit if the trip criterion is met. The molded case
circuit breaker with differential current protection combination is designed to open he molded
case circuit breaker contacts if the differential current reaches a specific value.
Note
The RCD module can only be combined with 3VL molded case circuit breakers with thermal
-
magnetic overcurrent release. I
t cannot be combined with a molded case circuit breaker with
ETU.
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 45
Standard features
● Mechanical trip display:
The Reset button on the RCD pops out when the RCD module trips the molded case circuit
breaker.
● Reset button:
This must be manually reset after the molded case circuit breaker has been tripped by the
RCD module. The molded case circuit breaker can only be reset and switched on again after
the RCD module has been reset.
● Cover:
Modifiable settings for ∆t and I∆n.
A sealable transparent cover is available for preventing modification.
● The RCD module has three LEDs:
– Green LED flashes: "Active" -> indicates that the RCD module is functional
– Yellow LED flashes: The fault current is between 25% < I∆< 50% of the set I∆n value
– Red LED flashes: The fault current I∆ is greater than 50% of the set I∆n value
● Test button:
The functionality of the RCD module is checked with the test button. If the test button is
pressed, differential current is simulated on a test winding attached to the summation current
transformer. When functioning correctly, the RCD module must trip the molded case circuit
breaker.
The test button must be pressed for at least the set delay time Δt.
● A line disconnector:
– makes it possible to disconnect the evaluation electronics of the RCD module from the
circuit without removing the primary cable or the busbars (e.g. before insulation tests).
– Limitation of the maximum RMS withstand voltage to an RMS value of 3500 V AC for
this feature, i.e. the RMS value of the voltage for max. 60 seconds for one insulation
test must not exceed 3500 V.
● Protection function from 50 V AC between phase and neutral conductor
● The RCD module has a surge current withstand capability of Ipeak = 2000 A. The standard
surge wave is defined as 8 / 20-µs waveform.
● The RCD module does not trip in the case of making currents.
Δt ≥ 0 Irms = 3000 A
Δt ≥ 60ms Ipeak = 20 x In x √2
● The molded case circuit breaker with differential current protection combination can be
supplied from both sides.
● Matching molded case circuit breaker standard accessories – covers, phase barriers, wire
connectors.
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
46 System Manual, 11/2013, 110 0110 - 02 DS 03
Special features of the VL160X
● The molded case circuit breaker is tripped via an electromagnetic trip relay installed in the
breaker accessories compartment to the left of the toggle lever. The trip unit in the
molded case circuit breaker is connected to the RCD module and receives a trip
command when the preset fault currents are reached.
● Internal accessories can still be installed to the right of the toggle lever.
● The Reset button functions in exactly the same way as on the RCD modules VL160 to
400 and is accessible via the molded case circuit breaker accessories cover supplied with
this module.
Note
Motorized operating mechanism with stored ener
gy mechanisms and rotary operating
mechanisms cannot be installed with this product.
Special features of VL160, VL250, VL400
● The molded case circuit breaker is tripped by means of a direct-acting tappet from the
RCD module to the system protection switch. The electromagnetic trip unit is integrated in
the RCD module.
● The Reset button pops out beyond the surface of the RCD module cover to indicate that
the RCD module has tripped the system protection switch. This unit prevents the system
protection switch contacts from closing before the Reset button of the RCD module has
been manually reset.
● This has the same design as the system protection switch accessories including the
accessories for external operating mechanisms as well as for fixed-mounted assembly,
plug-in assembly and withdrawable assembly.
● An auxiliary switch (changeover contact) is available. The contacts change status when
the RCD module trips the system protection switch.
● Remote tripping is supported. The customer connects a switch (NO contact) to terminals
X13.1 and X13.3 via a twisted-pair cable. The switching contact must have a minimum
switching capacity of 5 V/1 mA (e.g. SIEMENS 3SB3). If the NO contact is actuated, the
RCD module trips. The connection terminals X13.1 and X13.3 are galvanically isolated
from the system by means of a transformer (functional extra low voltage, FELV). The
maximum trip time of the molded case circuit breaker with differential current protection is
50 ms regardless of the set trip time delay Δt. In special cases, such as routing of the
cable outside, ensure by means of suitable cable routing or protection measures that the
amplitude of overvoltages (e.g. overvoltages due to thunderstorms) between the
conductor and ground is limited to 2.5 kV.
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 47
Special requirements
● Every RCD module requires a separate cable for remote tripping. It is not possible to use
one cable and connect two or more RCD modules in parallel. It is possible to use two or
more switches in parallel for remote tripping of an RCD module.
● Use an unshielded or shielded twisted-pair cable with a maximum capacitance of 36 nF
as well as a maximum resistance of 50 Ohms (total length = out and back).
● With a shielded cable, the shield must not be applied to the PE conductor of the system.
● A separate conductor must connect terminal X13.2 with the ground busbar (E or PE).
This connection is recommended for the prevention of electrostatic charge on the remote
tripping cable. This applies in particular when long cables (> 10 m) are used. If this is not
the case, the remote tripping cable is isolated.
Design of the RCD module
VL160X with RCD module I
VL160 with RCD module
①
Reset
Figure 4-2 RCD module for VL160
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
48 System Manual, 11/2013, 110 0110 - 02 DS 03
4.1.6
Single-pole operation with RCD module
Connection of the RCD module for single-pole operation
All 3-pole or 4-pole molded case circuit breakers with RCD module can be operated with 2
poles (L to N), since the power supply of the RCD module is supplied from all three external
conductors, and on 4-pole devices additionally from the N conductor.
Apart from the test current circuit, the RCD module is unrestricted in functionality if at least 2
conductors are connected.
When connecting the RCD module, you only have to ensure that the test current circuit
connected to current path 1-2 and 3-4 (marking) is functioning or is supplied with power.
The following connections are possible in 2-pole operation:
2-pole operation with a 3-pole molded case circuit breaker
● Connection of the network to current path 1-2 and 3-4 (any incoming supply side)
Figure 4-3 3-pole RCD
Note
Single-pole load
Series connectio
n of the current paths is not necessary in the case of single-pole load.
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 49
2-pole operation with 4-pole molded case circuit breakers
● Connection of the network to current path 1-2 and 3-4 (any incoming supply side) or
● connection of the network to current path 1-2 and N; however, a jumper is required here
from N to current path 3-4 (on the input or output side)
Figure 4-4 4-pole RCD
4.1.7
Ground-fault protection
Ground fault trip "G" (ground fault overcurrent protection) captures fault currents flowing to
ground that can cause fires in the plant.
Several molded case circuit breakers connected in series can be assigned time-graded
discrimination by means of the adjustable delay time. The delays can be reduced to 100 ms
by using a ZSI system.
Measurement method 1: Vectorial summation current formation
Ground fault detection in balanced systems
The three phase currents are evaluated using vectorial summation current formation.
Figure 4-5 molded case circuit breaker in balanced system
Functions
4.1 Protection functions
3VL IEC molded case circuit breakers
50 System Manual, 11/2013, 110 0110 - 02 DS 03
Ground fault detection in unbalanced systems
The neutral conductor current is measured directly. Only the ground-fault current is
measured for the 3-pole circuit breakers. In the case of the 4-pole circuit breakers, the
neutral conductor overload protection is also measured.
The overcurrent release calculates the ground-fault current using the vectorial summation of
the three phase currents and the neutral conductor current.
The 4th current transformer of the neutral conductor is installed internally in the case of 4-
pole molded case circuit breakers.
Figure 4-6 3-pole molded case circuit breaker, current transformer in neutral conductor current
Figure 4-7 4-pole molded case circuit breaker, current transformer installed internally
Measurement method 2: Direct detection of the ground-fault current via a current transformer in the
grounded neutral point of the transformer
The current transformer is installed direct in the grounded neutral point of the transformer.
Figure 4-8 3-pole molded case circuit breaker, current transformer in the grounded neutral point of
the transformer
Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 51
4.2
Internal accessories
4.2.1
Possible complements for the insulated accessory compartments
Figure 4-9 Possible complements for the insulated accessory compartments
Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
52 System Manual, 11/2013, 110 0110 - 02 DS 03
Note
ETU with communication 3-pole (3VL_7__-_M*) or 4-pole (3VL_7__-_N*)
If a communication
-capable ETU is used, the left-hand accessory compartment X2 contains
an auxiliary switch and an alarm switch.
Note
Max. no. of contact blocks
Maximum 6
contact blocks (HS) per molded case circuit breaker VL160X to VL400
Maximum 8
contact blocks (HS) per molded case circuit breaker VL630 to VL1600
4.2.2
Undervoltage release
Molded case circuit breaker with undervoltage release
If there is no voltage present, closing of the molded case circuit breaker is not possible. If
voltage is not applied to the releases, operation of the circuit breaker will result in no-load
switching.
Undervoltage release
The undervoltage release trips the molded
case circuit breaker when the voltage
fails.
Tripping can occur within a voltage range of
0.7 to 0.35
x US. Tripping occurs under
0.35
x US. Re-closure of the molded case
circuit breaker contacts is only possible once
the voltage has reached a value of 0.85 to
1.1
x US. Undervoltage releases can be
installed for electronic locking.
Undervoltage releases are installed in the right accessory compartment of the 3VL molded
case circuit breakers.
Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 53
4.2.3
Shunt release
Molded case circuit breaker with shunt release
The molded case circuit breaker with shunt release is used for remote protection. The shunt
release is used for remote tripping of the molded case circuit breaker. The molded case
circuit breaker is tripped by applying the operating voltage at the shunt release.
Shunt release
It is designed for short
-time operation and is therefore
equipped with an interrupt contact for self
-
protection. Shunt
releases are installed in the right accessory compartment of
the 3VL molded case circuit breakers.
Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
54 System Manual, 11/2013, 110 0110 - 02 DS 03
4.2.4
Auxiliary switches and alarm switches
Auxiliary and alarm switches are used to indicate the switching status of the molded case circuit
breaker
Auxiliary switches show the position of the main contacts ("ON" or "OFF").
Alarm switches transmit a signal when the molded case circuit breaker trips due to a short-
circuit or overcurrent, or when the shunt release, undervoltage release, test button, or RCD
module trips.
Family 1
Family 2
VL160X
VL160
VL250
VL400
VL630
VL800
VL1250
VL1600
Leading auxiliary switches when switching ON and OFF
The leading auxiliary switches (changeover switches) are available as accessories for front-
operated rotary operating mechanisms and door-coupling rotary operating mechanisms.
The following applications are possible:
Leading auxiliary switch for switching from "ON" to
"OFF"
Leading auxiliary switch for switching f
rom "OFF" to
"ON"
Each version, leading auxiliary switch for switching
on and off, can be equipped with one or two
changeover switches. The connecting cables of the
auxiliary switches are 1.5 m long.
Leading auxiliary switch when switching from "OFF" to "ON" (leading NO contact)
Functions
4.2 Internal accessories
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 55
Application example:
If the molded case circuit breaker is equipped with an undervoltage release, and the leading
auxiliary switch is installed in the rotary operating mechanism, the leading NO contacts make
it possible to supply the undervoltage release with power before the main contacts can be
closed.
Leading auxiliary switch for switching off (leading NC contact)
Application example:
In applications with thyristors, it is necessary to reset the power electronics of the converter
before the main circuit is switched off.
Molded case circuit breakers with leading auxiliary switches create a leading signal that
enables selective deceleration of the thyristor.
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 57
Application planning
5
5.1
Use with frequency converters
Combination of frequency converter and 3VL molded case circuit breaker
3VL molded case circuit breakers can be used as protection devices on the primary side in
systems in which frequency converters, variable-speed drives, and electronic motor control
devices are used. The thermal-magnetic and electronic trip units of the 3VL molded case
circuit breakers can be used in these applications. On account of RMS measurement, the
SENTRON VL trip units are not influenced by harmonics.
Figure 5-1 Frequency converters
Note
Alternative circuit breakers
SIRIUS
3RV circuit breakers can also be used for applications up to approximately 45 kW .
SIRIUS soft starters and 3VL molded case circuit breakers
For more detailed information, please refer to the soft starter catalogs and the selection
guides.
Visit our site on the Internet at:
Soft starter (http://www.siemens.de/sanftstarter)
Frequency converters / variable-speed drives and 3VL molded case circuit breakers
Please refer to the relevant catalogs for information on the new SINAMICS series,
MICROMASTER 4, and SIMOVERT MASTERDRIVES.
Application planning
5.2 Use of capacitor banks
3VL IEC molded case circuit breakers
58 System Manual, 11/2013, 110 0110 - 02 DS 03
5.2
Use of capacitor banks
Capacitor banks are used, for example, for reactive power compensation. In reactive power
compensation, also called power factor correction, the undesired reactive power of loads in
AC systems is reduced. Reactive power compensation is usually performed by
compensating inductive reactive power with capacitive load.
A combination of fixed and central compensations are used depending on the design of the
low-voltage system and the loads involved.
Molded case circuit breaker for protecting and switching capacitor banks
According to the relevant standards DIN VDE 0560 Part 41 / EN 60831-1 / IEC 70,
capacitors must operate under normal operating conditions with the current's RMS value
being up to 1.3 times the rated current of the capacitor. In addition, a further tolerance of up
to 15% of the real value of the power must be taken into consideration.
The maximum current with which the selected molded case circuit breaker can be constantly
loaded, and which it must also be able to switch, is calculated as follows:
IN max = IN x 1.5 (RMS value, RMS current)
Important values for selecting the molded case circuit breaker
More detailed information in the technical data: Capacitor banks (Page 152)
Abbr.
Designation
Q
n
Capacitor bank rated power in kVA
UN
Rated voltage of the capacitor
I
N
Rated current of the capacitor bank
IN max
Maximum expected rated current
I
i
Value for setting the instantaneous short-circuit release
IR
Value for setting the inverse-time delayed overload release
The following applies:
IN = QN / (√3 x UN)
IR = INmax = IN x 1.5
Ii> 9 x IR (minimum)
Application planning
5.3 Transformer protection on the primary side
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 59
5.3
Transformer protection on the primary side
The molded case circuit breaker as transformer protection on the primary side
When switching on low-voltage AC transformers, the extremely high inrush current peaks
place special demands on the trip unit or on the making capacity of the molded case circuit
breakers if these are also used to switch the transformer.
For most applications, an inrush current of 20 to 30 times the rated operating current is
expected in practice and must be taken into account when selecting the molded case circuit
breakers.
The maximum short-circuit current Ik of the 3VL molded case circuit breakers is 11 x In (rated
current). A molded case circuit breaker in the lower setting range must therefore be used for
transformer protection on the primary side.
Example: A transformer with 500 A rated current; 20 times the inrush current
Selected: ETU with In = 1000 A; setting range 0.4 - 1 x In = 400 A to 1000 A
50% of In = 500 A; Ii = 11 x In = 1000 A x 11 = 11000 A = 22 x current setting
Note
Disconnection of molded case circuit breaker
It is imperative to ensure that the minimum short
-circuit current Ikmin in accordance with
VDE
0100 can be disconnected using a protection facility (e.g. molded case circuit breaker).
The 3VL molded case circuit breaker can be disconnected using the short-time-delayed
short-circuit release (S), e.g. a 3VL with an ETU20, where it is possible to set the delay time
to up to 500 ms depending on the duration of the inrush current.
The short delay "bridges" the inrush current peak and the short-circuit protection can then
respond at low current values after a delay.
CAUTION
Molded case circuit breaker with phase failure protection
Molded case circuit breakers with phase failure protection must not be used. Their trip units
have protection against unbalanced network load which cannot be deactivated and can
lead to unintentional trips.
Application planning
5.4 Use in DC systems
3VL IEC molded case circuit breakers
60 System Manual, 11/2013, 110 0110 - 02 DS 03
5.4
Use in DC systems
The 3VL molded case circuit breakers 160X to VL630 with thermal overload and magnetic
short-circuit trip units (TMTU) are suitable for use in DC systems.
The 3VL 160 to VL1600 molded case circuit breakers with electronic trip units (ETUs) are
not
suitable for switching DC.
Selection criteria for molded case circuit breakers
The following are the most important criteria for selecting the optimal molded case circuit
breaker for protecting a DC system:
● The rated current determines the size of the molded case circuit breaker.
● The rated voltage determines the number of series-connected poles required for breaking
- 3 or 4 poles.
● The maximum short-circuit current at the connection point determines the breaking
capacity.
● The type of supply determines the circuit design.
Ampacity of current path
The rated current values are the same for both DC and AC applications.
Switching DC currents
In AC circuits, arc quenching is facilitated because the current flows through zero. These
preconditions do not apply for DC.
For this reason, a high arc voltage must be developed to interrupt the direct current.
Therefore, the breaking capacity depends on the arc quenching method and the line voltage.
Several switching contacts can be connected in series in order to achieve a higher arc
voltage.
Furthermore, the effects to be expected in the event of a ground fault or double ground fault
must also be considered.
Setting of the trip values
● Thermal overload release ("L" release):
Same settings as in 50 / 60 Hz systems.
● Instantaneous short-circuit release ("I" release):
The threshold values of the instantaneous short-circuit release ("I" release) increase by
30 to 40%. See also Chap. 9
Application planning
5.4 Use in DC systems
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 61
Example:
4000 A + 30% = 5200 A
There is also a tolerance of ± 20%
At the Ii = 4000 A setting, the instantaneous short-circuit release responds at
approx. 5200 A ± 20%.
As the current has to flow through all of the conducting paths, the following connections are
recommended in order to satisfy the thermal tripping characteristics.
Recommended connections for DC systems
Table 5- 1 Recommended connections / maximum permitted DC voltage Ue
Circuit with 3-pole molded
case circuit breakers
Circuit with 4-pole molded case
circuit breakers 1)
≤ 250 V DC
Switching capacity N
≤ 500 V DC
Switching capacity H
2-pole switching (ungrounded system)
If there is no possibility of a ground fault, or if every
ground fault is rectified immediately (ground-fault
monitoring), then the maximum permitted DC voltage is
600 V for both circuits.
On an ungrounded system, all poles must be switched
off.
≤ 500 V DC
Switching capacity H
≤ 600 V DC
Switching capacity L
2-pole switching (grounded system
)
The grounded pole is always assigned to the individual
conducting path, so that there are always 2 conducting
paths in series in a circuit with 3-
pole circuit breakers in
the event of a ground fault and 3 conducting paths in
series in a circuit with 4-pole circuit breakers in the
event of a ground fault.
≤ 600 V DC
Switching capacity L
≤ 600 V DC
Switching capacity L
1-pole switching (grounded system)
1) With 4
conducting paths in series, either the 4th pole must be equipped with a 100% release, or the 4th pole (N) must be
equipped with neither an overload release nor a short-circuit release.
Recommended connections for DC systems with voltages of more than 600 V DC (e.g. photovoltaic
plants)
Detailed information on request.
Technical Support: http://www.siemens.com/lowvoltage/technical-support
(http://www.siemens.com/lowvoltage/technical-support)
Application planning
5.5 Use in IT systems
3VL IEC molded case circuit breakers
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5.5
Use in IT systems
Use of the 3VL molded case circuit breakers in IT systems
The 3VL molded case circuit breakers up to size VL1250 have been tested in accordance
with IEC / EN 60947-2, Annex H (testing sequence for molded case circuit breakers for IT
systems) up to a maximum voltage (Ui max.) of 690 V AC. The 3VL8 and 3VL7 (1250 A)
cannot be used in an IT system.
The 3VL molded case circuit breakers for system protection from SIEMENS, optionally
available with thermal overload and electromagnetic short-circuit releases, or electronic trip
units, are suitable for use in IT systems. The molded case circuit breakers also meet the
requirements of IEC 60947-2 Annex H (EN 60947-2, Annex H). The respective options are
required here, and the necessary safety clearances (ventilation clearances) must be
observed.
Selection criteria for molded case circuit breakers
The devices are always dimensioned and selected independently of the relevant system
type. The circuit breaker is always selected in accordance with the maximum short-circuit
current in the IT system. The device is selected in accordance with the relevant Icu values of
the 3VL molded case circuit breaker. The neutral conductor is not grounded by definition in
the IT system.
The system operator ensures that no double ground fault can occur on the input or output
side of the molded case circuit breaker. In this case, the switching capacity of the IT systems
remains unchanged.
If this is not guaranteed, the values in accordance with the standard IEC 60947-2 Annex H
apply for single-pole short-circuits.
Application planning
5.5 Use in IT systems
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 63
Fault situation
The most critical fault for molded case circuit breakers in ungrounded IT systems is a double
ground fault on the infeed and load side of the molded case circuit breaker. If this fault
occurs, the entire phase-to-phase voltage is applied via one pole of the molded case circuit
breaker.
Figure 5-2 Double ground fault (ground fault and short-circuit to frame)
Explanation of the illustration
● Faults ① and ② simultaneously:
– Double ground fault on the load and infeed side
– Single-pole short-circuit, the full phase-to-phase voltage of 690 V is applied to main
contact L1
– Selection of the molded case circuit breaker according to their suitability as defined in
IEC 60947-2, Annex H
● Fault ③
– 2 or 3-pole short-circuit
– Multi-pole short-circuit, a voltage of 690 V /V 1.73 = 400 V is applied at the main
contacts
– The design of the molded case circuit breaker is in accordance with Icu/Ics
See also
Standards and specifications (Page 308)
Application planning
5.6 Use in motor protection
3VL IEC molded case circuit breakers
64 System Manual, 11/2013, 110 0110 - 02 DS 03
5.6
Use in motor protection
The overload and short-circuit releases are designed for optimal protection and direct
starting of three-phase AC squirrel-cage motors. The molded case circuit breakers for motor
protection are sensitive for phase failures and have an adjustable trip class.
The ETUs operate with a microprocessor.
Note
The 3VL circuit b
reakers with motor protection function are suitable for use in IE2 motors.
You can obtain detailed information for the use of the 3VL molded case circuit breaker with
IE3 motors on request.
Operating principle of the overcurrent releases
The tripping characteristic curves of the inverse-time delayed overload releases are specially
designed for overload protection of 3-phase AC motors.
With the inverse-time delayed overload release "L", the value IR can be set to be 0.4 to 1.0
times the rated current In of the molded case circuit breaker. This occurs in 0.01 increments
(e.g. 0.40 / 0.41 / 0.42 ... 0.99 / 1.0 x In), so that the molded case circuit breaker exactly
matches the rated current of the motor to provide optimal protection.
The current transformers in the 3VL molded case circuit breaker not only measure the load
current, they also supply power to the electronic trip unit. No external auxiliary power supply
is required.
This independence from an external energy supply guarantees a high standard of safety.
Area of application
Machine tools, manufacturing systems, presses, fans, air-conditioning units and packaging
machines all require motors that must be protected. This is the main area of application of
the 3VL molded case circuit breakers for motor protection.
Trip class
The 3VL molded case circuit breakers offer the option of selecting from various trip units with
fixed or adjustable trip classes that are suitable for differing motor applications.
ETU 10 M
This version is equipped with a thermal image, phase failure sensitivity and the fixed trip
class 10.
ETU 30 M
This version is equipped with an adjustable trip class 10 to class 30 in addition to the thermal
image and phase failure sensitivity.
Application planning
5.6 Use in motor protection
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 65
ETU 40 M
This version enables the parameters and the trip class 5 to class 30 to be configured step by
step using a menu on the LCD display that is built into the trip unit.
Trip classes
Trip class 5 is used for motors that have very simple start-up characteristics (those with a
short start-up time and a small mass moment of inertia). The class 30 releases are used to
protect motors that have to withstand difficult start-up characteristics (long start-up time and
large mass moment of inertia). The motor must be suitable for heavy-duty starting.
The trip class must be selected so that it corresponds to the overload factor of the motor
under operating conditions. You can find further information at the end of this chapter in the
figure "Current-time curve before and after overload, with thermal image".
Definition of the trip class
The trip class specifies the release time for balanced 3-pole loads, starting from the cold
state, with 7.2 times the set current Ir according to IEC 60947-4-1. Combinations with class
10 are normally used.
Applications that require a longer start-up time, such as fans with large blade diameters,
require a higher trip class.
Figure 5-3 ETU with trip classes 5, 10, 15, 20, 30
Tripping characteristic curve for molded case circuit breakers with electronic trip unit.
Application planning
5.6 Use in motor protection
3VL IEC molded case circuit breakers
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Thermal image
All 3VL molded case circuit breakers with electronic trip unit have a "thermal image" which
takes the pre-loading of the AC motor into consideration. The tripping times of the current-
dependent delayed overload releases are only valid for the unloaded (cold) state.
The pre-loading of the 3-phase AC motor must be taken into consideration in order to
prevent damage to the motor, e.g. after being frequently switched on without sufficient
cooling time.
Siemens offers the 3VL molded case circuit breakers with fixed thermal image to provide
maximum protection for the motor.
Functional principle of the thermal image
During operation, a thermal model of the motor is simulated in the ETU. This reduces the
response time of the molded case circuit breaker with thermal image such that further
overloads cannot damage the motor windings. The motor is switched off within a time limit
that is specified by the pre-loading.
An overload may also be the switch-on current of the motor.
After an overcurrent tripping, the tripping times are reduced in accordance with the tripping
characteristic curves.
A cooling time defined by the size of the motor is required before the motor can be switched
on again. This prevents the motor from being excessively thermally loaded by a current
immediately after an overload release occurs.
①
Without "thermal image"
②
With "thermal image"
Figure 5-4 Response time of the trip unit after overload release
Phase failure sensitivity
The "phase failure sensitivity" function is also integrated into the 3VL molded case circuit
breaker for motor protection. This ensures that the motor is reliably protected against
overheating if a phase interruption or a large fluctuation occurs.
The specified operational current IR is automatically reduced to 80% of the set value if the
RMS values of the operational currents in the three phases differ by 5 to 50% (depending on
release type).
Deviations of more than 50% mean the value of the current in the least loaded phase drops
to a level below 50% of the maximum loaded phase.
Application planning
5.7 Use in unusual environments:
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 67
5.7
Use in unusual environments:
If the 3VL molded case circuit breakers are to be used outside closed control cabinets or in
difficult operating conditions, the following information must be taken into account at the
planning stage:
Reduction factors under unusual operating conditions
● Altitude in excess of 2000 meters
● Temperature above 50 °C
● Frequencies outside the 50 / 60 Hz range
● Humidity
● etc.
You can find further details in DIN ISO 2533 "Standard Atmosphere".
Use at altitudes above 2,000 meters
The lower air density at altitudes above 2,000 meters affects the key electrical data of
molded case circuit breakers. The table in the Technical data (Page 142) shows the derating
factors that have to be taken into account when using the molded case circuit breakers at
altitudes above 2,000 m.
Use at different ambient temperatures
A reduction (derating) of the rated operational current of the 3VL molded case circuit
breakers is necessary if the ambient temperature around the molded case circuit breaker
exceeds 50 °C. The reference temperature is 40 °C for molded case circuit breakers with
RCD modules or for plug-in / withdrawable versions.
The permissible load for various ambient temperatures with reference to the rated
operational current of the molded case circuit breaker are shown in the technical data.
Furthermore, the following points must be taken into consideration, because each one of
these factors can influence the rated operational current and permissible load.
● Type of molded case circuit breaker (fixed-mounted, plug-in or withdrawable version)
● Type of main connection (vertical/horizontal busbar, cable)
● Ambient temperature around the molded case circuit breaker
● Altitude derating factors
● Temperature derating factors based on different trip units and connections
● Increased degree of protection
Application planning
5.7 Use in unusual environments:
3VL IEC molded case circuit breakers
68 System Manual, 11/2013, 110 0110 - 02 DS 03
Thermal-magnetic overcurrent releases
Thermal-magnetic overcurrent releases are calibrated to 50 °C. As a result, the tripping
times of the thermal overcurrent releases increase for a constant current at low
temperatures.
To correct the tripping times, the thermal overcurrent release settings must be changed by
the factor from the table "Derating factors for thermal-magnetic overcurrent releases" in the
technical data (lower settings).
Use in systems with other frequencies
If low-voltage switching devices designed for 50 / 60 Hz are to be used at other line
frequencies, the following points must be taken into consideration:
● Thermal effects on the system components
● Switching capacity
● Service life of the contact system
● Tripping characteristics of the overcurrent releases
● Behavior of the accessories
Thermal rating of the system components and conductors depending on the line frequency
Molded case circuit breakers designed for alternating current of 50 / 60 Hz can be used at
lower frequencies for at least the same rated currents. However,the permissible operating
current must be reduced at frequencies higher than 100 Hz to ensure the specified
temperature rise limits are not exceeded.
Influence of temperature and humidity on overcurrent releases
The relevant reduction in the rated operating current (derating) of the 3VL molded case
circuit breakers is also necessary if the operating temperature of 50 °C or 70 °C is exceeded
at a relative humidity level (non-condensing) of 95%.
Thermal-magnetic TM releases
Figure 5-5 Thermal-magnetic TM
0 °C to +70 °C, ☂ 95%
The SENTRON VL thermal-magnetic releases are designed for use in ambient temperatures
up to 70 °C and a relative humidity level (non-condensing) up to 95%. The appropriate
correction factors must be applied for ambient temperatures above 50 °C. You can find more
information in Chapter 11.4 "Reduction factors"
Application planning
5.8 Use in series connection
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 69
Electronic trip unit ETU
Figure 5-6 Standard ETU
-25 °C to +70 °C, ☂ 95%
The 3VL electronic trip units are designed for use in ambient temperatures up to 70 °C and a
relative humidity (non-condensing) up to 95%.
Electronic trip unit LCD ETU
Figure 5-7 LCD-ETU
-25 °C to +70 °C, ☂ 95%
The high-quality electronic trip units LCD ETUs are designed for use in ambient
temperatures up to 70 °C and a relative humidity (non-condensing) up to 95%. The
appropriate correction factors must be applied for ambient temperatures above 50 °C.
5.8
Use in series connection
In the case of molded case circuit breakers connected in series, the overload and short-
circuit protection is described as "selective" when, from the point of view of the direction of
energy flow, only the circuit breaker immediately upstream of the fault trips.
Current selectivity
The selectivity can be calculated in the
overload range
by comparing the time/current
characteristics. In the short-circuit range, this comparison leads to values that are too low.
The reason for this is that the trip unit behaves differently in the case of short-circuit currents
compared to its long-term behavior, e.g. in the case of overloads.
If the
short-circuit currents differ sufficiently
at the installation points of two molded case
circuit breakers, the instantaneous short-circuit releases can normally be set such that if a
short-circuit occurs behind the downstream circuit breaker, only this downstream breaker
trips.
If the
short-circuit currents are approximately the same
at the installation points of the
breakers, the grading of the tripping currents of the short-circuit releases only enables
selectivity up to a specific short-circuit current .
Application planning
5.8 Use in series connection
3VL IEC molded case circuit breakers
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This current is referred to as the selectivity limit.
If the values determined by the short-circuit current calculation (e.g. according to
IEC / EN 60909, DIN VDE 0102) at the installation point of the downstream circuit breaker
are below the selectivity limit listed in the respective table for the selected combination,
selectivity is guaranteed for all possible short-circuits at the installation point.
If the calculated short-circuit current at the mounting point is higher than the selectivity limit,
selective tripping by the downstream circuit breaker is only ensured up to the value listed in
the table. The engineer must judge whether the value can be considered to be sufficient
because the probability of, for example, the maximum short-circuit occurring is low.
Otherwise, a circuit breaker combination should be chosen whose selectivity limit lies above
the maximum short-circuit current.
Time selectivity
Selectivity can be achieved by time selectivity up to the threshold values of the
instantaneous short-circuit release. To achieve this, the upstream circuit breaker requires
delayed short-circuit releases, so that in the event of a fault, only the downstream circuit
breaker will disconnect the faulted system component from the supply.
Both the tripping delays and the tripping currents of the short-circuit releases are staggered.
Zone-selective interlocking - ZSI
Zone-selective interlocking (ZSI) has been developed by SIEMENS for the 3VL molded case
circuit breakers to prevent long, undesired release times when several molded case circuit
breakers are connected in series.
ZSI enables the tripping delay to be reduced to 50 ms for the circuit breaker upstream from
the location of the short-circuit.
When selecting, ensure that the molded case circuit breaker can handle the initial balanced
short-circuit current IK at the installation point.
The following are required for the ZSI function:
● A COM20 or COM21 communication module
● A communication-capable ETU
You can find further details in the following manuals:
● "SENTRON WL and SENTRON VL circuit breakers with communication capability -
PROFIBUS" (Order No. A5E01051347)
● "SENTRON WL and SENTRON VL circuit breakers with communication capability -
Modbus" (Order No. A5E02126886)
Application planning
5.9 Use in transfer control system
3VL IEC molded case circuit breakers
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5.9
Use in transfer control system
The 3KC ATC5300 transfer control device (automatic transfer control device) together with
two 3VL molded case circuit breakers with motorized operating mechanism (MO), forms the
transfer control system that can be used to switch automatically or manually between two
low-voltage power distribution systems.
Overview of the 3KC ATC5300 transfer control device
The ATC5300 controls the transfer between two power supplies fully automatically, while
taking account of set limit values and delay times. It detects fluctuations occurring in the
main power supply quickly and switches to the standby power supply. The control device
only switches to the standby power supply after it has ensured that the standby supply is
providing the required quality. The devices switch back to the main power supply, taking into
consideration the set parameters, once the required quality has been restored. If the standby
power supply and/or the main power supply is fed by a generator, the control device also
offers a wide range of settings, such as a generator lead time, generator delay time, and
generator start test at specified times.
The ATC5300 can be used for the following applications:
● Supply of UPS (uninterruptible power supply) systems
● Emergency supply of public buildings, hotels and airports
● Supply of data centers and communication systems
● Supply of industrial processes requiring a high level of operational continuity.
Note
You can find more detailed information on the 3KC ATC5300 transfer control device in
the Industry Mall (www.siemens.com/industrymall).
Application planning
5.9 Use in transfer control system
3VL IEC molded case circuit breakers
72 System Manual, 11/2013, 110 0110 - 02 DS 03
Structure of the transfer control system
● Infeeds line 1 (main system) and line 2 (standby system) are connected to the ATC5300.
● In case of system disturbances, the ATC5300 activates the 3VL molded case circuit
breakers Q1 and Q2 accordingly
● The 3VL molded case circuit breakers must be equipped with the following accessories:
– One motorized operating mechanism per molded case circuit breaker
– One alarm switch per molded case circuit breaker
– Two auxiliary switches 1NO/1NC per molded case circuit breaker
Application planning
5.9 Use in transfer control system
3VL IEC molded case circuit breakers
System Manual, 11/2013, 110 0110 - 02 DS 03 73
3KC ATC5300 transfer control device in a Modbus RTU network
The ATC5300 supports the Modbus communication protocol (RTU or ASCII) via the RS485
interface.
Easy system integration through integrated Modbus interface, for integrating into a power
management system, for example
Application planning
5.10 Use in communication environment
3VL IEC molded case circuit breakers
74 System Manual, 11/2013, 110 0110 - 02 DS 03
5.10
Use in communication environment
The 3VL molded case circuit breakers with communication-capable ETUs can be integrated
into PROFIBUS or MODBUS RTU networks via the COM20 / COM21 communication
modules.
Network topology
Network topology
Note
When using communication
-capable ETUs, the left-hand accessory compartment X2
contains an auxiliary switch and an alarm switch.
