Phase control relays CZF-331

Phase control relays CZF-331

CZF-331

With two separated contacts 2C/O.
Three phase monitors serve to protect the three-phase electric motors supplied from three-phase mains, against phase collapse in at least one phase or against phase-to-phase voltage asymmetry, threatening to damage the motor.

 


 

Functioning
Phase collapse in at least one phase or voltage unbalance  between phases above set value causes switching-OFF the motor. The  motor switching-OFF occurs with 4 sec delay, which prevents any accidental motor disconnecting at temporary voltage drop. The re-connection will occur automatically at voltage increase of 5V above activation voltage (i.e. of value of voltage hysteresis). At occurrence of these disturbances, it is not possible to  set a motor in motion.
 




Power supply voltage3 ├Ś 400 V + N
Cooperation with power generatorsNO
Phase failure / asymmetry monitoringYES
Phase sequence controlNO
Contactor contact monitoringNO
The executive element2 ├Ś relay
Maximum load current2 ├Ś 8 A
Contact configuration2 ├Ś NO/NC
Separation of the contactYES
Voltage asymmetry40├Ě80 V
Voltage hysteresis5 V
Switch off delay4 s
Power control3 ├Ś LED green
terminalscrew terminals 4,0 mm┬▓
Tightening torque0,5 Nm
Power consumption1,2 W
Working temperature-25├Ě40┬░C
dimensions3 modules (52,5 mm)
Assemblyon rail 35 mm
Level of securityIP20






System which prevents automatic motor restart after power recovery

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