R-K Electronics, Inc. Protection Relays & Systems TVM-400-24-1100

The TVM series is a three-phase voltage relay designed to protect motors by monitoring line voltage, phase rotation, and phase loss. It is a plug-in unit with an 8-pin octal termination and a dust cover, weighing approximately 4.5 ounces. The device operates on 100VAC to 600VAC, 50/60Hz systems, with the 400 series configured for 410 to 490VAC line voltage. It features fixed 0.5-second pick-up and drop-out delays, output contacts rated at 10 amps at 250VAC, 1/2 HP at 250VAC, 1/3 HP at 125VAC, or 10 amps at 30VDC, and a status LED. Operating ambient temperature ranges from 0°C to 40°C, with storage from -40°C to 85°C. Phase rotation is set to A-B-C, and over/under voltage thresholds are adjustable at ±10%, ±13%, or ±16% of nominal voltage. The relay energizes only when all phases are present, voltages are within range, and rotation is correct.