H475156230 - Carlo Gavazzi Group

Specifications are subject to change without notice (04.11.05) 1

Monitoring Relays

• 3-phased current metering relay

• Measures on current with 3-phased current

metering transformers, type A74-.. ...

• Measures if all 3-phase currents are within

set limits

• Upper and lower limits separately adjustable

• Output: 10 A SPDT relay

• For mounting on DIN-rail in accordance with

DIN/EN 50 022

• H4-housing

• LED-indication for power supply and output ON

• AC power supply 2-phases

3-phase current metering re-

lay with separate setting of

upper and lower current level.

For DIN-rail mounting. Often

used where a certain applica-

H 475 156 230

tion such as a large mixer has

to be kept within a set current

value in order not to overload

the system.

Type Selection

Input Specifications

Input from current

transformers A74-.. ...

Terminal 5 red, phase L1

Terminal 6 white, phase L2

Terminal 7 yellow, phase L3

Terminal 8 black

Input voltage 0.4-4 Vp

Plug Output Supply: 115 VAC Supply: 230 VAC Supply: 400 VAC

Screw SPDT H 475 156 115 H 475 156 230 H 475 156 400

terminals

Output SPDT relay

Rated insulation voltage 250 VAC (rms)

(cont./elect.)

Contact ratings (AgCdO) µ (micro gap)

Resistive loads AC 1 10 A/250 VAC (2500 VA)

DC 1 1 A/250 VDC (250 W)

or 10 A/25 VDC (250 W)

Small inductive loads AC 15 2.5 A/230 VAC

DC 13 5 A/24 VDC

Mechanical life ≥30 x 106operations

Electrical life AC 1 ≥2.5 x 105operations

(at max. load)

Operating frequency ≤7200 operations/h

Dielectric strength

Dielectric voltage ≥2 kVAC (rms) (cont./elect.)

Rated impulse withstand volt. 4 kV (1.2/50 µs) (cont./elect.)

(IEC 60664)

Power supply AC types Overvoltage cat. III (IEC 60664)

Rated operational voltage (IEC 60038)

Through term. 22 & 24 115 115 VAC ±15%, 45 to 65 Hz

230 230 VAC ± 15%, 45 to 65 Hz

400 400 VAC ± 15%, 45 to 65 Hz

Voltage interruption ≤40 ms

Dielectric voltage 2 kVAC (rms) (supply/elect.)

Rated impulse withstand volt. 4 kV (1.2/50 µs) (line/neutral)

(line/line), no direct connec-

tion to electronics

Rated operational power 2.5 VA

Product Description Ordering Key

Housing

Type

Output

Power supply

3-Phase Max. and Min. Current Control

Type H 475

Output Specifications

Supply Specifications

2Specifications are subject to change without notice (04.11.05)

H 475

Reaction time τ= 0.2 s, worst case reaction

time may be up to 5 x τ

Indication for

Power supply ON LED, green

Output ON LED, red

Environment (IEC 60947-1)

Degree of protection

IP 20 B/front IP40 D (IEC 60529)

Pollution degree 3 (IEC 60664)

Operating temperature -20° to +50°C (-4° to +122°F)

Storage temperature -50° to +85°C (-58° to +185°F)

Weight 300 g

CE Marking Yes

The relay requiring 2-phased

power supply is used with

one of the 3-phased current

metering transformers, types

A 74-10 5, A 74-10 20, A 74-

11 100, A 74-11 500. When

the supply voltage is applied

the relay operates, provided

the current flowing in all 3-

phase cables exceeds the

minimum current of the trans-

formers and phase cables

must be drawn through the

transformer from the same

side.

Mode of Operation

When the power supply is

applied the relay operates

when all 3-phase currents are

within the set levels, and re-

leases when one or more

phase-phase currents ex-

ceed the upper set level or

drop below the set level. The

relay operates again when all

3-phase currents are within

the set levels. Hysteresis on

operate is approx. 2%. The

phase sequence through the

current metering transformer

is arbitrary.

Wiring Diagram

Measuring range

3-phased current metering

transformers measure in the

following 4 ranges:

A 74-10 5 = 0.5- 5 A

A 74-10 20 = 2 - 20 A

A 74-11 100 = 10 - 100 A

A 74-11 500 = 50 - 500 A

Range setting

Left potentiometer:

Lower limit. From 8 to 98% of

nominal max. value for the

current metering transformer

employed.

Range Setting

Right potentiometer:

Upper limit. From 10 to 100%

of nominal max. value for the

current transformer em

ployed.

If the lower limit is set above

the upper limit, the output re-

lay releases and cannot be

activated before the lower limit

is set lower than the upper

limit.

Hysteresis

Max. limit: - 2%

Min. limit: + 2%

Upper limit

Hysteresis

Lower limit Hysteresis

Relay ON L1, L2, L3

Operation Diagram

Power supply

H 475

PE = term 8

Term. 5: Red core

Term. 6: White core

Term. 7: Yellow core

Term. 8: Black core

General Specifications