Phase control relays CZF2-B

Phase control relays CZF2-B


Contact connected to power supply voltage.
Three phase monitor serves 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 or against damage of contacts threatening to damage the motor.



Phase collapse in at least one, optional phase or voltage unbalance between phase fixed actuation threshhold 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. Shining of red diode LED along with simultaneous disconnecting the apparatus permanently, indicates contactor contacts damage. Reactivation of the apparatus is possible (after contact repair), after disconnecting from supply all three phases (fuses) and then, after switching-ON anew.


Power supply voltage3 ├Ś 400 V + N
Cooperation with power generatorsNO
Phase failure / asymmetry monitoringYES
Phase sequence controlNO
Contactor contact monitoringYES
The executive elementrelay
Maximum load current10 A
Contact configuration1 ├Ś NO
Separation of the contactNO
Voltage asymmetry55 V
Voltage hysteresis5 V
Switch off delay4 s
Power control2 ├Ś LED
terminalscrew terminals 4,0 mm┬▓
Tightening torque0,5 Nm
Power consumption1,6 W
Working temperature-25├Ě40┬░C
dimensions2 modules (35 mm)
Assemblyon rail 35 mm
Level of securityIP20

System which prevents automatic motor restart after power recovery