The ABB CM‑SRS.12S is a single‑phase current monitoring relay designed for industrial control applications where precise supervision of current is required. It is intended to monitor AC and DC current in a single‑phase supply and provides an output signal via a single changeover (SPDT) contact when the monitored current crosses set thresholds. The device is mounted on a standard 35 mm DIN rail and connects with screw terminals for reliable wiring. With adjustable settings and fast response, it is used in automation systems, motor protection circuits, alarms, and control logic where accurate current monitoring and switching output are necessary.