R-K Electronics, Inc. Protection Relays & Systems TVM-400-22-0002

The TVM is a three-phase voltage relay designed to protect motors by monitoring line voltage, phase rotation, and phase loss. It is mounted as a plug-in device with an 8-pin octal termination and includes a dust cover. The device operates on 100VAC to 600VAC, 3Ø, at 50/60Hz, with a fixed 0.5-second pick-up and drop-out delay. The 400 series variant detects line voltages between 410 and 490VAC and offers a 16% adjustable over/under voltage threshold. Output contacts are rated for 10 amps at 250VAC, 1/2 HP at 250VAC, 1/3 HP at 125VAC, or 10 amps at 30VDC. The relay energizes only when all phases are present, voltages are within range, and rotation is A-B-C. A status LED indicates normal operation. It weighs approximately 4.5 ounces, operates between 0°C and 40°C, and is listed for use with motor starters and overloads.