ABB S203U-K8 Molded Case Circuit Breaker 3-Pole

ABB S203U-K8 is a three‑pole molded‑case circuit breaker from the System pro M compact family, designed to protect three‑phase circuits in distribution panels and MCCs. The K8 designation identifies an 8 A rated current variant, with a compact 0.42 kg per unit weight and a three‑pole format appropriate for space‑constrained installations. This model is part of ABB’s UL 489 listed S200/U series, providing reliable thermal‑magnetic overcurrent protection for industrial loads and three‑phase equipment such as motors and pumps. The specific part number corresponds to order code 2CDS273417R0407, confirming its identity as the S203U‑K8 within ABB’s catalog, and aligning with the broader S203U lineup that shares core electrical characteristics while offering precise current ratings across the range. Designed for integration into ABB’s System pro M compact ecosystem, it supports consistent protection across compatible accessories and panel designs, delivering predictable trip behavior in a compact form factor suitable for commercial and light industrial applications.