R-K Electronics, Inc. Protection Relays & Systems TVM-300-20-0010

The TVM-300-20 is a three-phase voltage relay designed to protect motors by monitoring line voltage, phase rotation, and phase loss. It operates on 350 to 420VAC, 3Ø, with a fixed 0.5-second pick-up and drop-out delay. The relay has 10A contacts rated for 250VAC, 30VDC, 1/2 HP at 250VAC, or 1/3 HP at 125VAC. It uses an 8-pin octal plug-in package with a dust cover and weights approximately 4.5 ounces. Operation is valid between 0°C and 40°C, with storage from -40°C to 85°C. The output relay de-energizes if voltage deviates by ±13% from nominal, or if phase rotation is incorrect or a phase is lost. A status LED indicates normal operation. The relay is listed for use with the OT-08 socket for 300, 400, and 600 series models.