Phase control relays CZF-333

Phase control relays CZF-333


Without neutral lead. Prevents against symmetrical and asymmetrical voltage drop.
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.




In case  the voltage asymmetry above set value between phases causes the switching-OFF the motor. The switching-OFF the motor also occurs in case of phase-to-phase voltage drop below 320V. 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
Cooperation with power generatorsYES
Phase failure / asymmetry monitoringYES
Phase sequence controlNO
Contactor contact monitoringNO
The executive elementrelay
Maximum load current10 A
Contact configuration1 ├Ś NO/NC
Separation of the contactYES
Voltage asymmetry20├Ě50 V
Voltage hysteresis5 V
Switch off delay4 s
Power control3 ├Ś LED green
terminalscrew terminals 4,0 mm┬▓
Tightening torque0,5 Nm
Power consumption1,6 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