ABB WVM011AL Three Phase Voltage Monitor Relay

ABB WVM011AL is a three-phase voltage monitor relay that guards three‑phase equipment by watching the voltages on all three lines and initiating a control action if any voltage falls outside the acceptable window. It monitors a 500–600 VAC range, making it suitable for common three‑phase power distribution in industrial facilities. The unit provides a single Form C (SPDT) output relay rated up to 10 A at 250 VAC, enabling it to drive contactors or other control circuitry that disconnects or trips a motor or load when a fault is detected. The output is energized only when all monitored voltages are within tolerance and the device has been reset after a fault, ensuring deliberate restart after fault conditions. This makes it well‑suited for protecting three‑phase motors, pumps, compressors, and other polyphase equipment from undervoltage, overvoltage, or loss of a phase, conditions that can cause overheating, mechanical stress, or equipment damage. In addition to fault protection, the WVM011AL can be integrated into broader safety or interlock schemes where simple, relay‑based signaling is preferred for clear, mechanical control of downstream devices. The WVM series is designed for straightforward integration into standard industrial control panels and wiring schemes, delivering a compact, easy‑to‑install solution for 3‑phase voltage monitoring.