Schneider Electric 8430MPS U Motor Protection Relay

Schneider Electric's Square D 8430MPS U is a socket-mounted phase-failure relay that protects three-phase motors by monitoring incoming line voltages and signaling a fault via a single SPDT output contact. The U version uses an 11-pin blade socket and is rated for a 5 A, 480 V, 3-phase circuit, enabling it to drive a contactor or other control input in a motor protection scheme. After a fault is detected and the control action is taken, the relay automatically resets when the fault condition clears, returning to monitoring mode to guard against repeat faults. This device is part of Schneider Electric's Square D line of phase protection relays, designed for installation in industrial panels using 11-pin socket configurations for straightforward replacement in existing installations.