Under/Over Voltage Relay 400V Phase Failure Monitoring

This compact under/over voltage relay monitors 400V three-phase systems for voltage fluctuations and phase failure, protecting electrical equipment from damage due to abnormal supply conditions. It features adjustable thresholds (75–95% for under-voltage, 105–125% for over-voltage), SPDT contact output, and a time-delay range of 0.2–10 seconds, with DIN rail mounting on a single EN 50 022 module. Ideal for electrical contractors, facilities managers, and industrial installations requiring automatic load protection and phase sequence monitoring.