Three-phase asymmetry and sequence monitors CKF-337

Three-phase asymmetry and sequence monitors CKF-337

CKF-337, 5908312593225

Product description

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.

Prevents against symmetrical and asymmetrical voltage drop


In case of 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  put a motor to motion. Change of phase sequence, before the monitor, which causes change of motor rotation direction (in relation to that primarily set) along with impossibility of switching-ON the motor.

Power supply voltage3 × 400 V
Cooperation with power generatorsYES
Phase failure / asymmetry monitoringYES
Phase sequence controlYES
Contactor contact monitoringNO
The executive elementrelay
Maximum load current10 A
Contact configuration1 × NO/NC
Separation of the contactYES
Voltage asymmetry20÷60 V
Voltage hysteresis5 V
Switch off delay0,2÷5,0 s adjusted
Power control4 × LED
Terminalpluggable terminal blocks 4,0 mm²
Tightening torque0,5 Nm
Power consumption1,6 W
Working temperature-25÷40°C
Dimensions3 modules (52,5 mm)
Assemblyon rail 35 mm
Ingress Protection MarkingIP20