R-K Electronics, Inc. Protection Relays & Systems TVM-400-22

The TVM-400-22 is a three-phase voltage relay designed to protect motors by monitoring line voltage, phase rotation, and phase loss. It is mounted plug-in with an 8-pin octal termination and housed in a dust cover. The unit operates within a line voltage range of 410 to 490 VAC, with over/under voltage thresholds set at ±16% of nominal voltage. It features a fixed 0.5-second pickup and drop-out delay, an output rating of 10 A at 250 VAC, and a power consumption of 1.5 VA. The relay energizes only when all three phases are present, voltages are within range, and rotation is A-B-C. Ambient operating temperature ranges from 0°C to 40°C, with storage from -40°C to 85°C. A status LED indicates normal operation. Weight is approximately 4.5 oz. The relay is listed and compatible with the OT-08 socket for the 400 series.