ABB ST203M-D20

The ABB ST203M-D20 is a 3-pole miniature circuit breaker designed to handle up to 20 amps at 480Y/277V AC. Part of the ST200M Series, this compact device features a D-curve trip characteristic, which provides reliable protection against short circuits and overloads. With a 10 kA interrupting capacity, it’s engineered to safely break fault currents in various industrial applications. This breaker meets UL 1077 and CSA 22.2 standards, ensuring solid performance and safety. For those in the know, it’s sometimes called a supplemental protector or simply the “ST203M.” You can find this product available through BSP Automation, making it easy to source for your control panel needs.