ABB S203UP-K1 Industrial Molded Case Circuit Breaker

ABB S203UP-K1 is a three-pole molded-case circuit breaker from ABB’s System pro M compact S200 UP family, designed to protect industrial feeders and equipment in control panels. Rated for 1 A, it operates up to 480 V AC and provides a short-circuit breaking capacity of 10 kA at 480 V. The unit uses a thermal-magnetic trip mechanism with a K-type characteristic, delivering reliable overload and short-circuit protection while minimizing nuisance trips. It is DIN-rail mountable and supports feed-through configurations, with suitability for reverse-feed wiring in compatible layouts. The S203UP-K1 carries UL, CSA, and IEC approvals, aligning with common international standards for MCCBs. As a compact 3P MCCB, it is well suited for protecting motors, conveyors, and other industrial loads, offering current-limiting behavior to reduce let-through energy and improve panel reliability. This model reflects ABB’s longstanding expertise in industrial protection devices and is the right choice when a 1 A, 3-pole breaker with 480 V capability is required for panel boards, sub-feed applications, or machine control circuits.