SCHAFFNER
Your number one name for EMC
rod-cored,
saturating and current
compensated types
RFI SUPPRESSION CHOKES
SCHAFFNER
RFI suppression chokes
CONTENTS General information
Choke range ...............................................2
Introduction to EMC & key standards.......3
Types of choke and their application........4
Typical noise-suppression circuits............5
Further publications available....................6
Technical data
Current-compensated chokes
RD Series.............................................7
RN Series...........................................10
Rod-cored chokes
RF Series............................................12
Saturating chokes
RI Series.............................................14
Addresses and contact details................16
Choke family
✓✓✓7
✓✓✓7
✓✓✓7
✓✓✓7
✓✓10
✓✓12
✓✓12
✓✓12
✓✓✓14
✓✓✓14
✓✓✓14
RFI suppression chokes
0.1 0.2 0.5 1 10 100 1000
0.1 1 10 100
Current rating (A)
Inductance value (mH)
For common mode noise
For differential mode noise
Saturating chokes
For 3-phase/3-phase+neut.
PCB mounting
With flying leads
Catalog page
EMC compliance:
a comprehensive choke range
Schaffner offers an exceptionally broad
range of discrete chokes for suppressing
radio frequency interference (RFI), allowing
optimized circuitry for EMC compliance to
be designed easily and economically. This
catalog details current-compensated,
saturating and non-saturating choke types,
providing the ideal components to suppress
any form or combination of common-mode
and differential-mode noise. With around
150 standard products, spanning a broad
spread of inductance values and current
ratings up to 150A (up to 500A on request),
and available in a variety of packaging
styles and circuit configurations suitable for
single- or three-phase systems, designers
can quickly create optimum filtering
solutions for almost every application.
Rapid choke selector
This chart provides an overview of our standard families of chokes, allowing you to quickly identify suitable components for your
application, and go directly to the relevant technical data. Further general introductory information on filter design using discrete
chokes is provided on the following pages.
RD Series
(5000)
(6000)
(7000)
(8000)
RN Series
RF Series
(51-101)
(201)
(211)
RI Series
(100)
(200)
(400)
2
3
EMC compliance is now a
fundamental element of the
electrical/electronics equipment
design process, with legislation in
Europe to make compliance
obligatory. This section provides
an introduction to interference and
noise limits - using the influential
European standards as an example
- with an introduction to the three
main forms of choke components
and their application.
Permissible noise limits
The various standards set down limits for
conducted EMI emissions. These limits are
measured in voltage and given in dBµV
where 0dB is 1µV. The interference is
measured using a measurement receiver
which has defined bandwidths and
receivers. The two receivers used are a
quasi-peak detector, and an average
detector. To ensure repeatability of the
measurements, the impedance of the
mains supply must be constant. The
standards calls for a defined artificial mains
network - sometimes called a line
impedance stabilization network (LISN) -
which gives a defined impedance to the
noise and also helps filter any noise on the
mains which may affect the measurements.
Figure 1 shows the limits for EN 50081-1,
which is the European generic standard for
residential, commercial and light industrial
environments, and Figure 2 shows the
limits for EN 50081-2, which is the
European generic standard for the
industrial environment.
Above 30MHz, radiated noise interference
is measured as radiated noise instead of
conducted noise. This takes place on an
open field test site using defined antennas.
Figure 1. Permissible interference limits
for EN 50081-1
Interference sources and
spectrums
The most common sources of conducted
EMI are power electronic products such as
switched mode power supplies (SMPS),
pulse width modulated (PWM) frequency
inverter motor drives and phase angle
controllers.
The emissions spectrum typically starts off
very large at low frequency and rolls off as
frequency increases. The point at which
the noise falls below the permitted limits
depends on several factors, the most
important being the frequency of operation
and the switching time of the
semiconductor devices.
Interference spectrums generated can be
either continuous, as in the case of phase
angle controllers (see Figure 3), or discrete
(see Figure 4), which is typical of an SMPS.
Figure 4. Discrete spectrum
Interference propagation
EMI can propagate by two means:
• by radiation - where the energy can be
coupled either through magnetic or
electric fields, or as an electro-magnetic
wave between the source and victim.
• by conduction - where the EMI energy
will propagate along power supply and
data cables.
Radiated and conducted EMI cannot be
thought of as totally separate problems
because noise conducted along a cable
will, to some extent, be radiated because
the cable will act as an antenna. The
radiation will increase as the cable length
becomes comparable to the wavelength of
the noise. Also, the cable will act as a
receiving antenna and pick up radiated
interference.
Below about 100-200MHz, the most
efficient radiators in a system are usually
the power supply and data cables. Proper
filtering of these cables will reduce
radiation due to the cables as well as
conducted interference.
Above about 100-200MHz, PCB tracks and
short internal cables will start to become
efficient radiators. To reduce this radiation
PCBs should be laid out to reduce track
length and loop areas; ground planes
should be used if possible. Decoupling of
digital ICs is very important and shielding
may be necessary.
Interference types
To understand the problems associated
with conducted EMI it is first necessary to
understand the two modes of conducted
propagation: differential mode
(symmetrical mode) and common mode
(asymmetrical mode). Differential mode
interference appears as a voltage between
the phases of the system and is
independent of earth; the differential mode
currents flow along one phase and return
along another phase (see Figure 5).
Common mode noise appears as a voltage
between each phase and earth. The
common mode currents flow from the
noise source to earth (usually via a
General information on EMC
and filter design using discrete chokes
0.15 Frequency (MHz)
0.5 5 30
Level
(dBµV)
66
79 73
60
Quasi-peak
Average
INDUSTRIAL
Level
(dBµV)
66 Quasi-peak
Average
LIGHT INDUSTRIAL & DOMESTIC
46
56
0.15 Frequency (MHz)
0.5 5 30
60
50
56
46
Frequency Hz
Level
dB
Frequenz Hz
Pegel
dB
Level
dB
Frequency Hz
Figure 2. Permissible interference limits
for EN 50081-2
Figure 3. Continuous spectrum
4
parasitic capacitance) along the earth path
and return along the phases (Figure 6).
Figure 5. Differential mode interference
(VDM)
Figure 6. Common mode interference
(VCM)
Suppressing interference
Interference can be reflected towards its
source by incorporating an LC network in
the noise path. This prevents interference
energy from leaving a suppressed device
and entering the power supply line. An
efficient inductor-capacitor combination to
protect against line-conducted
interference consists of:
• series inductances in the interference
paths
• Cx capacitors between phase and
neutral
• Cy capacitors between phases and
earth
Three main types of chokes may be used
for this purpose:
• current-compensated - with multiple
windings to avoid saturation (loss of
effective inductance) of the core
material
• saturating chokes - which are ideal for
reducing fast current changes
• rod-cored chokes - which present a
constant inductance even at high
currents
Current-compensated chokes
(RN & RD Series)
This type of component consists of a ring
core with two or more windings, potted in
a plastic housing. It is used to attenuate
common-mode or asymmetric (P/N➔E)
interference signals, by being connected
in series with the phase and neutral lines
of an AC powerline input. The magnetic
fields produced by this winding technique
cancel each other out. Full inductance is
only presented to interference signals
which flow asymmetrically from
phase/neutral to earth. Symmetrical
components of the noise are also
attenuated by the leakage inductance of
the windings. The impedance of the choke
at powerline frequencies is therefore
negligible, resulting in practically zero
voltage drop. These chokes are typically
used in conjunction with suppression
capacitors as follows:
• in phase-angle control circuits where the
desired degree of suppression cannot be
achieved by saturating chokes alone
• for suppressing high interference levels
from ultrasonic generators, fast rectifiers,
switched mains equipment etc
• for suppressing equipment with no earth
connection
• for input filters to protect digital circuitry
from mains-borne interference
Saturating chokes (RI Series)
Saturating-type chokes change
impedance at the moment of switching,
and can be used to attenuate differential-
mode or symmetrical (P➔N) interference,
as generated by phase angle control
devices such as thyristors and triacs.
Interference levels can be brought within
the limits of national and international
regulations by using these chokes in
conjunction with appropriate suppression
capacitors. For optimum attenuation,
chokes must be connected as close as
possible to the semiconductor switching
device. A simple single-stage suppression
circuit is shown in Figure 7; this can be
made into a dual-stage filter by the load
itself and one additional capacitor.
Rod-cored chokes (RF Series)
In contrast to saturating types, rod-cored
chokes present a constant inductance.
They are also suitable for attenuating
differential-mode or symmetrical (P➔N)
interference, particularly lower frequency
interference up to around 500kHz. Single
and dual rod-cored chokes are ideal for
the construction of RFI suppression filters
for the 150kHz frequency region of
EN 50081.
Operating current
The maximum operating current for
components in this catalogue is specified
at an ambient temperature of 40˚C (Fig 8).
Figure 8. Maximum permissible current
as a function of ambient temperature
Because Schaffner chokes are
manufactured to meet the IEC 68 climate
class (HMF, HFK, GFK and GLF classes),
the maximum internal temperature
reached in the choke is in the region of
100 to 125˚C. (Maximum ambient
temperature is 100 to 125˚C.) The formula
below provides the relationship between
ambient temperature and permissible
current loading:
Iperm = Inom.
√
ϑmax. – ϑambient
ϑmax. – 40
VDM
Line
Neutral
Earth
VCM
VCM
Line
Neutral
Earth
Load
P
N
E
IT
RI
C
Figure 7. Saturating choke in series with a
thyristor
120
100
80
60
40
20
070
Nominal current
(100%)
at 40˚C
ambient temperature
80 90 100 110 120 130
60 ˚C
% of nominal current
50
40
3020
5
The following diagrams illustrate
some commonly-used noise
suppression circuit designs.
Application engineers are available
throughout Schaffner’s worldwide
network of support centres to help
customers choose and design
optimal circuits for specific EMC
problems.
Single-phase power control. The circuit
in Figure 9 controls the amount of power
delivered to the load. The use of a filter
based on a saturating-type choke (from
the RI Series) - sited as close as possible
to the switching element - provides short-
duration impedance to suppress the noise
precisely at the times of switching.
Figure 9. Application of a saturating
choke in a single-phase system
Three-phase power control. The circuit
in Figure 10 illustrates the use of a filter
based on saturating-type chokes (from the
RI Series) in a three-phase rectifier with a
resistive load. Sited as close as possible to
the thyristor switching elements, the
chokes provide short-duration impedance
to suppress noise precisely at the times of
switching.
Figure 10. Application of saturating
chokes in a three-phase system
Suppressing common-mode
interference. The circuit in Figure 11
illustrates the use of a current-
compensated type choke (from the RN
Series) in conjunction with a few discrete
components, to provide an economic filter
to suppress common-mode interference
between the AC mains and a switched-
mode power supply.
Suppressing differential and common-
mode noise. The circuit in Figure 12 adds
another stage to the previous circuit to
combat differential-mode interference.
This is achieved by means of a filter based
on non-saturating rod-cored chokes from
the RF Series, which are ideal for removing
lower frequency noise such as that
generated at typical power supply
switching frequencies.
Figure 12. Two-stage powerline filter with
differential- and common-mode
suppression
Some typical noise suppression
circuit designs
E
N
P
Cx Cx
Cy Cy Cy Cy
Equipment
RF RN
RF
E
N
P
Cx Cx
Cy Cy
Power
supply
RN
E
E
N
P
Cx
Cy Cy
Controller
Load RI
L3
L2
L1 Cx
Cx
Cx
Cx
Cy Load
RI
RI
RI
RI
RI
RI
Figure 11. Simple powerline filer to
remove common-mode noise, based on a
current-compensated choke
6
SCHAFFNER
Further publications available
Schaffner offers a comprehensive range of
power components, and publishes further
catalogues on:
• powerline filters with IEC inlets
• single-phase filters
• three-phase filters
• pulse transformers
Numerous application notes are also
available to help designers understand
and apply these components. Schaffner
also offers a comprehensive range of
stimulus and measurement
instrumentation for EMC conformance.
7
Choke selection table Choose the choke RD xxxx offering the required current rating and inductance characteristics. The name
provides a verification of selection: in RD wxyz-??-??, w = diameter of housing in cm; x = housing height (1 denoting standard); y =
number of lines (2 = phase+neut., 3 = 3-phase, 4 = 3-phase+neut.), and z = connection type (2 = PCB pins, 7 = wire); -??-?? indicates
current and inductance ratings.
SCHAFFNER
RD Series
These chokes employ current-compensated windings to present a large
inductance to common-mode noise signals and handle peak currents
without saturating, utilizing toroidal ferrite cores to pack high inductance
values into compact housings. The family is ideal for interference
suppression in medium-to-high current applications such as
uninterruptible and switched-mode power supplies, and DC stages of
inverters. With a choice of over 40 versions, in a range of package styles,
designers can quickly create optimal filter solutions for any application.
•
6 to 64A ratings
•
0.2 to 25mH inductances
•
up to 600VAC or 850VDC
•
DC to 400Hz frequencies
•
PCB-mount or flying-lead versions
•
dual, triple and quad choke configurations
Current-compensated chokes
Nominal
current
A @ 40ºC
Choke type R†
mΩ/
path
Circuit
symbol
Inductance
L*
mH/path
Weight
approx.
g
RD 7137-6-12m0
RD 7137-10-6m6
RD 7137-16-2m8
RD 7137-25-1m3
RD 7137-36-0m5
12
6.6
2.8
1.3
0.5
340
380
380
440
400
6
10
16
25
36
60.60
21.90
10.70
4.45
2.75
RD 6127-6-15m0
RD 6127-10-9m0
RD 6127-16-3m0
15
9
3
235
235
235
6
10
16
66.65
25.90
10.90
RD 6137-6-7m5
RD 6137-10-4m5
RD 6137-16-1m5
7.5
4.5
1.5
235
235
235
6
10
16
49
18.35
8.30
RD 7127-6-25m0
RD 7127-10-14m0
RD 7127-16-5m7
RD 7127-25-2m8
RD 7127-36-1m0
25
14
5.7
2.8
1
320
350
370
400
380
6
10
16
25
36
84.20
33.50
14.10
6.40
3.30
RD 5132-6-5m0
RD 5132-10-3m0
RD 5132-16-1m0
5
3
1
160
160
160
6
10
16
38
17.60
6.90
RD 5122-6-9m6
RD 5122-10-6m0
RD 5122-16-2m0
9.6
6
2
160
160
160
6
10
16
52.55
24.25
9.50
Environmental ratings
Maximum operating voltage: 600VAC/850VDC at 40˚C
High potential test voltage
winding-to-winding at 25˚C: 2500VAC, 1 minute, guaranteed
2500V, 50Hz, 2 sec, factory test
winding-to-housing at 25˚C: 4000VAC, 1 minute, guaranteed
Surge current at 10msec: 20 x Inominal at 25˚C
Power operating frequency: DC to 400Hz at 40°C
Operating/storage temp: -25ºC to +110˚C
Climatic class per IEC 68: 25/110/21
Flammability: UL94V0 (insulating tubes UL94V2)
Nominal
current
A @ 40ºC
Choke type R†
mΩ/
path
Circuit
symbol
Inductance
L*
mH/path
Weight
approx.
g
RD 8127 -16-12m0
RD 8127-25-5m0
RD 8127-36-3m0
RD 8127-50-1m0
RD 8127-64-0m8
12
5
3
1
0.8
590
630
690
640
710
16
25
36
50
64
20.05
8.45
4.55
2.50
1.60
RD 8137-16-5m0
RD 8137-25-2m5
RD 8137-36-1m5
RD 8137-50-0m6
RD 8137-64-0m5
5
2.5
1.5
0.6
0.5
630
650
720
700
780
16
25
36
50
64
11.60
6.40
3.65
2.15
1.35
RD 8147-16-3m0
RD 8147-25-1m3
RD 8147-36-0m8
RD 8147-50-0m3
RD 8147-64-0m2
3
1.3
0.8
0.3
0.2
650
650
760
740
820
16
25
36
50
64
9.25
5.05
3.00
1.75
1.10
RD 7147-6-6m0
RD 7147-10-3m5
RD 7147-16-1m5
RD 7147-25-0m7
RD 7147-36-0m2
6
3.5
1.5
0.7
0.2
320
370
390
430
400
6
10
16
25
36
45.10
19.10
8.50
3.65
2.30
Test conditions
* Measuring frequency: 1kHz; 500µA > 0.16mH < 1.6mH;
50µA > 1.6mH < 160mH; inductance tolerance +50%, -30%
†Resistance: tolerance max. ±15% at 25°C; < 200mΩ100mA
Electrical characteristics at 25°C ±2°C
8
Typical attenuation/resonance frequency characteristics
Typical saturation characteristics
Inductance (typical value in %) vs. nominal current (A DC)
RD 5122–/5132... RD 6127–/6137... RD 7127
RD 5122 and 5132
RD 7137
RD 6127 and 6137
RD 7147 RD 8127
RD 7127, 7137, 7147
RD 8137 RD 8147
RD 8127, 8137, 8147
Ind. Ind. Ind.
xInxInxInxIn
Ind.
9
Choke
50 60 70
5150 +5
-0
35 40
10
4.1 +0.3
-0 6.1
25 20
15 ∅40 ± 0.4 Sizes vary according to ratings - see separate table below
200 +5
-0
50
20
5
80
120º
RD 5122 RD 5132 RD 6127 RD 6137 RD 7127 RD 7137 RD 7147 RD 8127 RD 8137 RD 8147
BOTTOM
SIDE
BOTTOM
SIDE
±0.5
±0.5
±0.5
±1
±0.3
±0.3
-
-
-
Tol.*
mm
G
F
K
A
E
A
E
K
G
CC
D
BB
H
H
F65
2
1
3
4
21
3
4
2
1
3
4
56
2
1
3
4
5
6
78
A
E
C
B
H
I
34
12
RD 5122 RD 5132 RD 6127, 7127, 8127
RD 6137, 7137, 8137 RD 7147, 8147
* Measurements share this common tolerance unless otherwise stated Dimensions in mm; 1 inch = 25.4mm
A
B
C
D
E
F
G
H
I
K
A
E
C
B
H
D
A
E
C
B
H
D
Choke H
RD 5122-6-9m6 ∅1
-10-6m0 ∅1.3
-16-2m0 ∅1.6
RD 5132-6-5m0 ∅1
-10-3m0 ∅1.3
-16-1m0 ∅1.6
RD 6127-6-15m0 ∅1
-10-9m0 ∅1.5
-16-3m0 ∅1.8
RD 6137-6-7m5 ∅1
-10-4m5 ∅1.5
-16-1m5 ∅1.8
RD 7127-6-25m0 ∅1
-10-14m0 ∅1.4
-16-5m7 ∅1.8
-25-2m8 ∅2.4
-36-1m0 ∅2.7
RD 7137-6-12m0 ∅1
-10-6m6 ∅1.5
-16-2m8 ∅1.8
-25-1m3 ∅2.5
-36-0m5 ∅2.7
Choke H
RD 7147-6-6m0 ∅1
-10-3m5 ∅1.4
-16-1m5 ∅1.8
-25-0m7 ∅2.4
-36-0m2 ∅2.5
RD 8127-16-12m0 ∅2
-25-5m0 ∅2.4
-36-3m0 1.5 x 4.5
-50-1m0 1.7 x 5
-64-0m8 2.5 x 5
RD 8137-16-5m0 ∅2
-25-2m5 ∅2.4
-36-1m5 1.5 x 4.5
-50-0m6 1.7 x 5
-64-0m5 2.5 x 5
RD 8147-16-3m0 ∅2
-25-1m3 ∅2.4
-36-0m8 1.5 x 4.5
-50-0m3 1.7 x 5
-64-0m2 2.5 x 5
Pin diameter/section sizes
(dimension H)
+6
-0
Mechanical data
10
SCHAFFNER
RN Series
These chokes employ current-compensated windings to present a large
inductance to common-mode noise signals and handle peak currents
without saturating, utilizing toroidal ferrite cores to pack high inductance
values into compact form-factors. The dual-configuration component
family offers an ideal basis for building multi-stage interference
suppression circuits for low-to-medium current applications such as
uninterruptible and switched-mode power supplies, regulators, DC-DC
converters, and frequency inverters. With a choice of 48 versions,
in eleven different packages, designers can quickly create optimized
filtering solutions for any particular requirement.
•
0.3 to 10A ratings
•
0.7 to 100mH inductances (dual choke configurations)
•
100kHz-3MHz common-mode resonance frequencies
•
11 different PCB-mount housing sizes
Current-compensated chokes
Choke selection table Choose the choke RN ?xx offering the required current rating and inductance characteristics. ? determines package
style: insert 1 for a lower profile , 2 for a taller component with a smaller footprint. Example: RN 122-1/02 is a lower profile choke.
Nominal
current
A @ 40ºC
Choke type
? (1 = 2 = )
R†
mΩ/
path
Circuit
symbol
Inductance
L*
mH/path
Weight
approx.g
RN ?02-0.3/02
RN ?02-0.6/02
RN ?02-1/02
RN ?02-1.5/02
RN ?02-2/02
12
4.4
3
1.6
1.1
2/3
2/3
2/3
2/3
2/3
0.3
0.6
1
1.5
2
1275
385
205
100
70
RN ?12-0.4/02
RN ?12-0.5/02
RN ?12-0.6/02
RN ?12-0.8/02
RN ?12-1.2/02
RN ?12-1.5/02
RN ?12-2/02
RN ?12-4/02
39
27
15
10
6.8
3.3
1.8
0.7
5/6
5/6
5/6
5/6
5/6
5/6
5/6
5/6
0.4
0.5
0.6
0.8
1.2
1.5
2
4
1460
1250
465
370
245
135
75
27
Environmental ratings
Maximum operating voltage: 250V at 40˚C
High potential test voltage
winding-to-winding at 25˚C: 1500VAC, 1 minute, guaranteed
1500V, 50Hz, 2 sec, factory test
winding-to-housing at 25˚C: 4000VAC, 1 minute, guaranteed
Surge current at 10msec: 20 x Inominal at 25˚C
Power operating frequency: DC to 1kHz at 40°C
Operating temperature: -40ºC to +125˚C
Storage temperature: -40ºC to +125˚C
Climatic class per IEC 68: 40/125/56
Flammability: UL94V0
V
E
D
Nominal
current
A @ 40ºC
Choke type
? (1 = 2 = )
R†
mΩ/
path
Circuit
symbol
Inductance
L*
mH/path
Weight
approx.g
RN ?14-0.3/02
RN ?14-0.5/02
RN ?14-0.8/02
RN ?14-1/02
RN ?14-1.2/02
RN ?14-1.5/02
RN ?14-2/02
RN ?14-2.5/02
RN ?14-3/02
RN ?14-4/02
47
39
27
15
10
6.8
4.2
3.3
2
1.5
9/12
9/12
9/12
9/12
9/12
9/12
9/12
9/12
9/12
9/12
0.3
0.5
0.8
1
1.2
1.5
2
2.5
3
4
1750
810
500
375
200
130
102
72
55
35
RN ?22-0.6/02
RN ?22-0.8/02
RN ?22-1/02
RN ?22-1.5/02
RN ?22-2/02
RN ?22-2.5/02
RN ?22-3/02
RN ?22-4/02
47
39
18
10
6.8
5.6
4.5
3.3
17/21
17/21
17/21
17/21
17/21
17/21
17/21
17/21
0.6
0.8
1
1.5
2
2.5
3
4
1180
1000
610
220
147
105
80
45
RN ?42-0.5/02
RN ?42-1/02
RN ?42-1.4/02
RN ?42-2/02
RN ?42-4/02
RN ?42-6/02
82
33
27
6.8
3.3
1.8
32
32
32
32
32
32
0.5
1
1.4
2
4
6
2700
810
500
190
66
20
RN 152-1/02
RN 152-2/02
RN 152-4/02
RN 152-6/02
RN 152-8/02
RN 152-10/02
68
18
6.8
3.9
2.7
1.8
54
54
54
54
54
54
1
2
4
6
8
10
1300
350
87
41
22
14
RN 143-0.5/02
RN 143-1/02
RN 143-2/02
RN 143-4/02
RN 143-6/02
100
47
10
3.9
1.8
33
33
33
33
33
0.5
1
2
4
6
2900
880
230
58
20
Test conditions
* Measuring frequency: 10kHz; 5mA < 16µH;
500µA > 16µH < 160µH; 50µA > 160µH < 16mH;
50mV > 16mH < 160mH; inductance tolerance +50%, -30%
†Resistance: tolerance max. ±15% at 25°C;
≤20mΩ1A; > 20mΩ≤200mΩ100mA; > 200mΩ≤2Ω10mA
Electrical characteristics at 25ºC ±2ºC
(RN 142/242/143/152 pending)
11
Typical attenuation/resonance frequency characteristics
RN ?02 RN ?12 RN ?14
RN ?42 RN 143 RN 152
RN ?22
dB
70
60
50
40
30
20
10
0
0.5 Amp
6 Amp
dB
70
60
50
40
30
20
10
0
0.5 Amp
6 Amp
dB
70
60
50
40
30
20
10
0
1 Amp
10 Amp
Typical saturation characteristics
Inductance (typical value in %) vs. nominal current (A DC)
RN ?02/?12/?14/?22 RN ?42/143/152
%
100
90
80
70
60
50
40
30
20
10
0
Ind
RN ?02
RN ?22
RN ?12
RN ?14
%
100
90
80
70
60
50
40
30
20
10
0
Ind
RN ?42/143
RN 152
1 2 3 4 n x 1n
10k 100k 1M 10M 10k 100k 1M 10M 10k 100k 1M 10M
1 2 3 4 n x 1n
14
14
9
10 15
10 4 ± 0.6
0.6
17.7
17.1
12.6
0.8
22.5
21.5
13.2
20.1
12.5
28
27
16.5
25
15
18.2
8.8
13.5
15.21
5.08
4.5
18
12.5
20
15
10 4
23
15.5
25
10
12.5
31
18
29.3
12.5
15
33.1
32.5
19.7
30
20
31
18
34.3
12.5
15
43
41.8
25
40
15
4.3 4.2 4.5
1.2
RN 102 RN 112 RN 114 RN 122 RN 202 RN 212 RN 214 RN 222 RN 142 RN 242 RN 152
± 0.3
± 0.3
± 0.3
± 0.2
± 0.2
± 0.5
± 0.1
Tol.*
mm
* Measurements share this common tolerance unless otherwise stated
Dimensions in mm; 1 inch = 25.4mm
A
B
C
D
E
F
G
Mechanical data
BOTTOM
Choke
RN 143
SIDE
A
C
G
F
C
G
F
C
G
F
C
GG
F
C
F
D
EB
A
DA
D
A
D
E
E
B
BEB
A
D
EB
RN 102 RN 112, 114, 122, 142, 143 RN 202 RN 212, 214, 222, 242 RN 152
12
SCHAFFNER
RF Series
These chokes present a constant inductance, and are ideal for
attenuating differential-mode or symmetrical interference problems,
particularly at lower frequencies up to around 500kHz. They are
suitable for replacing saturating or current-compensated chokes in
higher power three-phase systems handling currents in 100A+ range.
•
0.2 to 150A ratings (higher currents on request)
•
0.1mH to 92mH inductances
•
fast-on or PCB-mount versions
Rod-cored chokes
Choke selection table
Nominal
current
A @ 40ºC
Choke type R†
mΩ
Circuit
symbol
Inductance
L*
mH
Weight
approx.
g
RF 51-4
RF 61-16
RF 71-35
RF 71-75
RF 81-75
RF 81-150
RF 101-150
2.4 (2)
1.2 (1.2)
0.58 (0.35)
0.1 (0.06)
0.42 (0.3)
0.1 (0.08)
0.28 (0.22)
250
1300
2720
2800
9060
9400
22000
4
16
35
75
75
150
150
310
40
12
2
3.7
0.95
2.25
RF 201-0.2/02
RF 201-0.5/02
RF 201-1/02
RF 201-2/02
RF 201-0.2/07
RF 201-0.5/07
RF 201-1/07
RF 201-2/07
RF 201-6/07
92 (90)
18.5 (18)
4.6 (4.4)
1.3 (0.84)
92 (90)
18.5 (18)
4.6 (4.4)
1.3 (0.84)
0.13 (0.08)
30
32
35
27
32
34
30
30
29
0.2
0.5
1
2
0.2
0.5
1
2
6
34000
6300
1900
500
34000
6300
1900
520
68
V
E
D
Nominal
current
A @ 40ºC
Choke type R†
mΩ
Circuit
symbol
Inductance
L*
mH
Weight
approx.
g
RF 211-0.5/02
RF 211-1/02
RF 211-2/02
RF 211-4/02
RF 211-6/02
RF 211-10/02
RF 211-0.5/14
RF 211-1/14
RF 211-2/14
RF 211-4/14
RF 211-6/14
RF 211-10/14
50 (47)
13.6 (12.5)
3.8 (3.3)
0.92 (0.68)
0.39 (0.33)
0.15 (0.1)
50 (47)
13.6 (12.5)
3.8 (3.3)
0.92 (0.68)
0.39 (0.33)
0.15 (0.1)
75
70
70
74
75
70
72
71
74
74
76
73
0.5
1
2
4
6
10
0.5
1
2
4
6
10
10200
3000
820
202
100
42
10200
3000
820
202
90
33
(RF 201/RF 211)
Test conditions
* Measuring frequency: 1kHz; 500µA > 0.16mH < 1.6mH;
50µA > 1.6mH < 160mH; inductance tolerance +50%, -30%
(values in brackets according to VDE 0565-2)
†Resistance: tolerance max. ±15% at 25°C; < 200mΩ100mA;
> 200mΩ≤ 2Ω10mA; > 2Ω≤ 20Ω1mA
Electrical characteristics at 25ºC ± 2ºC
Typical attenuation/resonance frequency characteristics
RF 201 RF 211
RF 51/61/71 RF 81/101
Environmental ratings
Maximum operating voltage: 380/500V at 40˚C
High potential test voltage
RF 201 / RF 211
winding-to-rod core at 25˚C: 2500VAC, 1 minute, guaranteed
2500V, 50Hz, 2 sec, factory test
RF 51 - RF 101
winding-to-inserts at 25˚C: 3000VAC, 1 minute, guaranteed
3000V, 50Hz, 2 sec, factory test
Surge current at 10msec: 20 x Inominal at 25˚C
Power operating frequency: DC to 1kHz at 40°C
Operating/storage temp:
RF 201 / RF 211 -40˚C to +110˚C
RF 51 - RF 101 -25˚C to +110˚C
Climatic class per IEC 68:
RF 201 / RF 211 40/110/21
RF 51 - RF 101 25/110/21
13
Mechanical data
75 ± 0.5
35
34
100
+10
-0
66
26
∅4.2
∅1.06
145
50
55 15 ± 2
131
37 ∅6.5
∅5
191.5 ± 1
61 ± 0.5
65 ± 0.5
177.5
47 ± 0.5
270 ± 10
90
95 ± 3
45
226
60
M6
9
425 ± 2
130 ± 2
130
+10
-0
60
140
90
M8
15
RF 51 RF 61 RF 71 RF 81 RF 101
+0.2
-0
± 0.3
± 0.3
±3
± 0.25
± 0.25
± 0.1
-
± 0.3
+0
-1
Tol.*
mm
Choke
* Measurements share this common tolerance unless otherwise stated
Dimensions in mm; 1 inch = 25.4mm
* Measurements share this common tolerance unless otherwise stated
Dimensions in mm; 1 inch = 25.4mm
SIDE
BOTTOM
HD
C
DD
CC
K
G
D
C
K
G
I
RF 51 RF 61, 71 RF 81 RF 101
G
B
F
B
FB
F
B
F
EA
EA
E
E
EA A
G
48 52.5
16
18
5.1 110 ± 5
19
23.5
∅2.8 3.6
47
18.5
8.6
58
23
25.5
651 ± 0.15 6.5
0.8
48
0.8 ∅2
7.2 17.5
RF 201 RF 201 RF 201 RF 201 RF 201 RF 201 RF 211 RF 211
-xx/02 -0.2/07 -0.5/07 -1/07 -2/07 -6/07 -xx/02 -xx/14
± 0.3
± 0.2
± 0.3
± 0.5
± 0.2
± 0.2
+0.2
-0
± 0.1
± 0.1
± 0.2
± 0.1
Tol.*
mm
A
B
C
D
E
F
G
H
I
K
L
SIDE
BOTTOM
DRILLINGS FOR PCB MOUNTING
Choke
A
B
C
D
E
F
G
H
I
K
HD
C
B
A
∅
1.3
∅
1.3
37.5
50
12.5
16.25
BB
LG
F
EE
G
DK
AA
B
LG
E
A
H
ID
CK
I
D
C
C
RF 201-xx/02 RF 201-xx/07 RF 211-xx/02 RF 211-xx/14
RF 201-xx/02 RF 211-xx/02
14
SCHAFFNER
RI Series
The inductance of saturating-type chokes reduces as load current
increases, and is ideal for attenuating the differential-mode or
symmetrical interference generated by fast-switching thyristors, triacs,
transistors and phase angle control devices. Inductance values are
not shown because the leakage inductance is relatively high.
•
0.8 to 25A ratings
•
single or dual choke configurations
•
flying lead or PCB-mount versions
Saturating chokes
Choke selection table Choose the choke RI xxx offering the required current rating and component configuration.
Types with the letters PC in the name have pins for PCB mounting; others have flying lead wire connections.
Nominal
current
A @ 40ºC
Choke type R†
mΩ/path
Circuit
symbol Weight
approx.
g
RI 109 PC
RI 110 PC
RI 111 PC
RI 13
65
120
170
1320
2
3
6
25
280
148
42
10
RI 207 PC
RI 209 PC
RI 229 PC
RI 230 PC
RI 210 PC
RI 231 PC
50
40
30
50
65
80
0.8
2
2
3
3
5
1325
275
265
160
160
62
Environmental ratings
Maximum operating voltage: 500V at 40˚C
High potential test voltage
winding-to-winding at 25˚C
and/or winding-to-inserts: 2500VAC, 1 minute, guaranteed
2500V, 50Hz, 2 sec, factory test
Surge current at 10msec: 20 x Inominal at 25˚C
Power operating frequency: DC to 1kHz at 40°C
Operating temperature: -25°C to +110˚C
Storage temperature: -25°C to +110˚C
Climatic class per IEC 68: 25/110/21
Flammability: UL94V0
Test conditions
†Resistance: tolerance max. ±15% at 25°C; < 200mΩ100mA;
> 200mΩ≤ 2Ω10mA
Electrical characteristics at 25ºC ± 2ºC
Nominal
current
A @ 40ºC
Choke type R†
mΩ
Circuit
symbol Weight
approx.
g
RI 211 PC
RI 221 PC
RI 401 PC
RI 403 PC
RI 406 PC
RI 410 PC
RI 222
RI 415
RI 425
70
175
15
30
55
95
330
205
325
6
8
1.5
3
6
10
15
15
25
43
34
620
105
53
28
21
8
3.5
Typical saturation characteristics
Inductance (typical value in %) vs. nominal current in %
RI series typical
Ind.
%
Nominal current
15
32
24
30
17 M3
25
10 0.6 x 0.88
4
~6.5
40
30
35
18
30
12.5
~5.5
49
35
34
21
M4
40/20
20
∅1.15/1.13
6
~15
19.5
+0.55
-0
19.5
+0.55
-0
12.5
7.5
0.6 x 0.88
~4
25
25
25
12.5
∅1
~15
32
24
30
17
M3
15
4
~11
25
17.5
∅1.13
~15
23.3
23.3
18
15 10
∅0.8/0.9
~4/~6
28.5
28.5
21.5
20
0.6 x 0.88
32.5
+0.5
-0
32.5
+0.5
-0
25
17.5
~4/~4.5 ~6
33
33
28
15
0.75 x 1.1
RI 109 RI 110 RI 111/
RI 221 RI 207/
RI 401 RI 209 RI 210 RI 211 RI 229/
RI 403 RI 230/
RI 406 RI 231 RI 410
± 0.3
± 0.3
± 0.3
± 0.25
-
± 0.2
± 0.2
± 0.1
+0
-0.5
-
Tol.*
mm
A
B
C
D
E
F
G
H
J
K
15
+0
-0.6
/15
+
-
0.3
Mechanical data
PCB Mounting
Flying lead types
K
C
SIDE
BOTTOM
J
EHK
HK
C
G
F
A
DB G
F
A
BD
G
H
F
A
B
C
A
F
B
G
H
E
J
K
C
RI 109, 110, 111 RI 207, 209, 229, 230,
401, 403, 406 RI 210, 211, 221
RI 231, 410
SIDE
BOTTOM
C
H
E
G
F
A
DBG
F
A
DB
G
F
A
DB
J
I
C
E
J
I
K
C
E
J
I
K
RI 13 RI 415, 425RI 222
95
60 +1.3
-0
65
37
M5
~80
∼40
7 +1
-0
48 +0.3
-1.2
48
43 30
M4
∼35
∼35 10 6
200
35 +0
-0.5
49 +0
-0.5
34
∼22
∼36
48 +0.3
-1.2
48
43
∼39
∼35
RI 13 RI 222 RI 415 RI 425
±0.3
+0.3
-1.2
±0.3
± 0.25
-
-
-
±1
+0
-0.5
±10
Tol.*
mm
A
B
C
D
E
F
G
I
J
K
* Measurements share this common tolerance unless otherwise stated
Dimensions in mm; 1 inch = 25.4mm
* Measurements share this common tolerance unless otherwise stated
Dimensions in mm; 1 inch = 25.4mm
Choke
Choke
SCHAFFNER
Schaffner’s worldwide sales,
distribution and production network
HEADQUARTERS
Schaffner EMV AG
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Switzerland
Tel: (032) 6816 626
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FACTORIES
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16
SCHAFFNER
Schaffner EMV AG CH-4542 Luterbach, Switzerland
Tel: +41 32 6816 626 Fax: +41 32 6816 641 www.schaffner.com
690-438D ROS/August 1999
© 1998 Schaffner EMV. Specifications subject to change without
notice. All trademarks recognised.
Schaffner is an ISO-registered company. Its products are
designed and manufactured under the strict quality
requirements of the ISO 9001 standard.
Certified
ISO 9001
supplier
This document has been carefully checked. However, Schaffner
does not assume any liability for errors or inaccuracies.
