Phase Sequence Relay for Three-Phase Power Safety [Instant Fault Detection]

Yueqing Huilong’s phase sequence relay is an essential device for three-phase systems, detecting and responding to incorrect phase sequences that can damage motors and equipment. This relay uses electronic sensing to monitor phase order (R-S-T vs. R-T-S), triggering an alarm or shutdown within 0.5 seconds of detecting a reversal. It supports a wide voltage range (100-500V AC) and features adjustable trip delays (0-5 seconds), suitable for different system requirements. The relay’s compact housing (35mm DIN rail mount) with LED indicators provides clear status feedback, while the built-in surge protection (1000V) ensures reliability in unstable power environments. Ideal for motors, pumps, and generators, this relay prevents costly damage from phase sequence errors in industrial, commercial, and infrastructure applications.