Phase control relays CZF-331

Phase control relays CZF-331

CZF-331, 5908312593157

Product description

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.



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 × 400 V + N
Cooperation with power generatorsNO
Phase failure / asymmetry monitoringYES
Phase sequence controlNO
Contactor contact monitoringNO
The executive element2 × relay
Maximum load current2 × 8 A
Contact configuration2 × NO/NC
Separation of the contactYES
Voltage asymmetry40÷80 V
Voltage hysteresis5 V
Switch off delay4 s
Power control3 × LED green
Terminalpluggable terminal blocks 4,0 mm²
Tightening torque0,5 Nm
Power consumption1,2 W
Working temperature-25÷40°C
Dimensions3 modules (52,5 mm)
Assemblyon rail 35 mm
Ingress Protection MarkingIP20

System which prevents automatic motor restart after power recovery