The ABB 412N4175 Circuit Shield Undervoltage Phase Relay is a three-phase protection relay from ABB’s Circuit Shield family that monitors undervoltage conditions and phase sequence on all three supply lines. Designed for panel-mounted protection in electrical distribution, it helps prevent equipment damage by signaling or interlocking when voltage faults are detected across a 3‑phase system. Typical applications include motor control centers, switchgear, and industrial automation panels where reliable three-phase voltage is essential for safe operation.
