The ABB CM-MPS.41S is a three-phase voltage monitoring relay designed to detect phase failure, phase sequence (with disable option), overvoltage, undervoltage, and phase imbalance in three-phase networks. It operates with a closed-circuit 2-wire contact and features adjustable threshold values and time settings ranging from 0.1 to 30 seconds. Suitable for 300-500 VAC phase-to-phase supply at 50/60 Hz, it connects via screw terminals and is mountable on a DIN rail for easy installation.