Phase control relays CZF-B

Phase control relays CZF-B

CZF-B

With the fixed actuation threshold voltage asymmetry.
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 fixed actuation threshhold  causes switching-OFF the motor. The motor switching-OFF occurs with delay 4sec, 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 elementrelay
Maximum load current10 A
Contact configuration1 ├Ś NO
Separation of the contactYES
Voltage asymmetry55 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
dimensions2 modules (35 mm)
Assemblyon rail 35 mm
Level of securityIP20



System which prevents automatic motor restart after power recovery