ABB ST203M-D50 is a three-pole miniature circuit breaker from ABB’s System Pro M Compact family (often listed as S203M-D50), rated at 50 A with a D-curve trip characteristic for 3-phase AC circuits. Optimized for 400 V AC systems, it delivers reliable overload and short-circuit protection with a breaking capacity up to 15 kA at 400 V, making it suitable for industrial control panels and machine protection where compact, easy-to-wire protection is needed. This 3P device integrates with ABB’s System Pro M Compact lineup for streamlined panel layouts and coordinated protection with other ABB protective devices.
