ABB ST203M-D5

The ABB ST203M-D5 is a compact 3-pole miniature circuit breaker designed to handle 5 amps at 480Y/277V AC. Featuring a D-curve trip characteristic, it’s built to provide reliable protection against short circuits and overloads with a breaking capacity of 10 kAIC. Part of the ST200M series, this breaker meets UL 1077 and CSA 22.2 standards, making it a solid choice for supplemental circuit protection. Distributed through BSP Automation, the ST203M-D5 is a dependable component that engineers often rely on to keep systems running smoothly—definitely a real workhorse in its class.