ABB ST203M-K4

The ABB ST203M-K4 is a 3-pole miniature circuit breaker designed to handle 4 amps at 480Y/277V AC. Part of the ST200M series, this breaker features a K-curve trip characteristic and offers a breaking capacity of 10 kAIC, making it a solid choice for supplemental protection in electrical systems. Known for its reliability and compliance with UL 1077 and CSA 22.2 standards, this unit is a dependable pick for keeping circuits safe—perfect for anyone who needs a no-nonsense, compact breaker that gets the job done without fuss. You can find the ST203M-K4 through BSP Automation, which makes sourcing this handy piece of gear straightforward.