ABB ST203M-B50 Safety Relay Module 24VDC Coil

ABB ST203M-B50 is a three-pole miniature circuit breaker rated for 50 A, designed to protect three-phase circuits in electrical distribution panels and machine enclosures. It provides overcurrent protection via a thermal-magnetic trip mechanism and is designed for standard DIN-rail mounting in ABB switchgear assemblies. Typical applications include motors, pumps, conveyors, and other three-phase equipment in industrial and commercial environments where reliable interruption of fault currents is required. As part of the ST203M family, the ST203M-B50 combines compact form factor with robust protection for medium-to-high three-phase loads; refer to ABB's official datasheet for the exact rated voltage, breaking capacity, and terminal arrangement specific to this model.