Asea Brown Boveri S203-K5 Molded Case Circuit Breaker

The ABB S203-K5 is a three-pole molded-case circuit breaker in ABB’s S200 family, rated for 5 A and intended to provide reliable branch-circuit protection in low‑voltage environments across commercial and light industrial installations. It is designed for 480Y/277 VAC service at 50/60 Hz and uses a thermal-magnetic trip mechanism with a K-type characteristic to trip quickly on overloads or short circuits across all three phases, delivering selective protection for three-phase feeders and associated loads. With a 6 kA interrupting capacity at 480 VAC, the S203-K5 offers robust short-circuit protection while meeting UL/CSA/IEC listings for recognized safety and performance in panelboards and control enclosures; it is configured for DIN-rail mounting in compact form factors. As part of ABB’s miniature molded-case breaker lineup, the S203-K5 combines precise overcurrent protection with a compact footprint suitable for spaces-conscious panel installations and applications requiring dependable 3-phase protection.