Digital phase sequence and phase failure sensor, 16A 2-mod. CKM-11 EXT10000267

The CKM-11 phase sequence sensor is used to protect devices powered from a three-phase network (e.g. motors) against damage in the event of a phase voltage failure, phase voltage asymmetry or incorrect phase sequence. The asymmetry threshold value is factory-set at 55 V. The sensor also protects against a symmetrical voltage drop by switching off the relay if the voltage on any phase drops below 150 V (regardless of the asymmetry level). The device is powered from any phase, which means that voltage on one phase is enough for it to be fully functional. The 4-s switch-off delay and voltage hysteresis make the sensor resistant to short-term voltage fluctuations.