ABB ST203M-D1

The ABB ST203M-D1 is a compact 3-pole miniature circuit breaker designed for reliable protection in electrical systems. Rated for 1 amp and suitable for 480Y/277V AC applications, this breaker features a D-curve trip characteristic, which helps handle short-circuit conditions up to 10 kA interrupting capacity. Part of the ST200M series, it’s an excellent choice for supplemental circuit protection compliant with UL 1077 and CSA 22.2 standards. Distributed by BSP Automation, this breaker is built to deliver dependable performance in a sleek, space-saving package—perfect for those who need solid protection without the bulk.