ABB 1SVR730885R4300 Sirius Safety Relay System

ABB 1SVR730885R4300 Sirius Safety Relay System is the CM-MPS.23S three-phase monitoring relay designed for safety-critical monitoring of a three-phase power supply. It provides two changeover contacts (2c/o) for signaling in safety circuits and operates from a 3 x 180-280 V AC supply (L1-L2-L3-N). The CM-MPS.23S variant is described in ABB's Measuring & Monitoring Relays catalog and is listed in ABB's ecatalog as 1SVR730885R4300, confirming its place in the Sirius Safety Relay family and its intended role as a multifunctional three-phase monitoring device. In practical terms, it monitors the presence and sequence of all three phases to guard motors, conveyors, and automation equipment against phase loss or abnormal conditions, with the two outputs allowing independent signaling to safety-related control circuits. The unit includes an adjustable timing function, enabling a delay from 0 to 30 seconds to accommodate safe-start or safe-stop sequences while ensuring prompt response to fault conditions. The CM-MPS series is designed for reliable integration with standard control systems that rely on precise phase monitoring to maintain machine safety and uptime.