Crouzet 84874033 Data Sheet

DIN Rail Mount 22.5 mm ETM22 Part number 84874033

Version ETM :

Controls temperature of machines using built-in PTC probes
Line break or probe short-circuit detection

Version ETM2 / ETM22 :

Fault latching function
Pushbutton for local reset
Remote reset via external contact
Pushbutton test facility
2 LEDs to indicate relay and power supply status

Part numbers

Specifications

Type

Output

Supply voltage

84 874 033

ETM22

2 changeovers

120 V AC

Supply voltage Un

230, 120 and 24 VAC 50 / 60 Hz
Galvanic isolation by transformer
24 VDC no galvanic isolation

Operating range

0.85 to 1.10 Un

Nominal power

3 VA

Maximal power

5 VA

Immunity from micro power cuts

10 ms Delay on pick

-up

500 ms

Insulation coordination

Category III, degree of pollution 2 conforming to IEC/EN 60664-1 / VDE 0110 : 4 KV/2

Max. resistance of cold probes

1500 ΩTrip threshold

3100 Ω±

10 %

Reset threshold

1650 Ω±

10 %

Short-circuit detection

0 - 10 ΩMeasurement voltage as per IEC/EN 60034

-11

≤2,5V

Repetition accuracy with constant parameters

±

0.5 %

Temperature drift

±

0.05 % / oC

Voltage-dependent drift

-2 %

Output

AgNi 90/10

Breaking capacity

2000 VA / 80 W

Max. breaking current

8 A AC

Max. breaking voltage

440 V AC

Min. breaking current

100 mA

Maximum rate

360 operations / hour at full load

Mechanical life (operations)

5 x 10

6

Electrical life

AC12 : 2000 VA - 105 operations
AC15 : Cos φ=

0,3 - 6000 operations

DC13 : L/R = 300 ms

- 6000 operations

Reset time

≤500ms

Response time

≤500ms

Display on ETM2/ETM22

- power supply

green LED

Display on ETM2/ETM22 - Relay

yellow LED

Class of protection (IEC EN/60529) - Term. block

IP 20 Protection class (IEC EN/60529) - Casing

IP 50 Housing material

Self-extinguishing

Weight (g)

145

Terminal capacity

2 x 1.5 mm2 with ferrule
2 x 2.5 mm2 without ferrule

Temperature limit operation (IEC 68.1.14)

(°C)

-

20→+60°C

Temperature limits stored (IEC 68.1.1/2)

(°C)

-

30→+70°C

Relative humidity (no condensation)

95 % (+2 % ; -3 %)

Principles

05/09/2014 www.crouzet.com

Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected

Operating principle

Control relay is used in combination with PTC thermistor probes (not supplied) for thermal protection of machines (motors, alternators, transformers, etc). The probes are placed at critical points on
the equipment to be protected (normally inserted into the stator windings of motors). The resistance of the PTC probe has a positive temperature coefficient. As soon as the nominal trip temperature
of the probe is exceeded, the resistance of the probe increases rapidly. Protection relay detects this and opens the power supply circuit of the protected equipment (eg motor) and the yellow fault
indicator LED lights up (version ETM2/ETM22).

Test button

The ETM2/ETM22 has a TEST button which can be used to simulate a thermal overload in order to test the service condition of the relay.

Tripping

The relay drops out as soon as the protected equipment is subjected to a thermal overload, short-circuit or break in the probe measuring circuit.

Early warning of tripping

If the equipment being protected has another PTC proble with a lower nominal trip temperature, a second ETM/ETM2/ETM22 relay can be used to give early warning of tripping and thus prevent
breaks in operation.

Control relay ETM/ETM2/ETM22 is automatically reset as soon as the temperature drops below the trip threshod (the yellow fault indicator LED goes out).

The relay is reset either using the RESET pushbutton on the front face or by opening the external contact S2 (remote reset), or by cutting the auxiliary power supply (terminals A1 - A2).
If the auxiliary power is cut for a period of time greater than the reset time (500 ms), the relay is reactivated if the proble detects a normal temperature when the power supply voltage is restored.

N

o

Legend

Unit power-up

Resistance between terminals T1 and T2

Output relay

Principles

N

o

Legend

Unit power-up

Latching contact

Resistance between terminals T1 and T2

Output relay

Principles

05/09/2014 www.crouzet.com

Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected