The ABB 1SVR730885R4300 is a CM-MPS.23 three-phase monitoring relay. It watches for phase sequence, phase failure, and phase asymmetry on a three-phase supply — a standard guard for motor-driven loads where a phase loss can burn out a winding or reverse a conveyor unexpectedly.
Deployment context
The three-phase monitoring relay sits between the incoming supply and the motor contactor coil, so a phase fault drops the contactor before the motor sees an unbalanced supply.