Asea Brown Boveri S203U-K10 Molded Case Circuit Breaker

The S203U-K10 is a 3-pole molded case circuit breaker from ABB’s S200 U series, rated for 10 A at 240 V AC and designed to protect three‑phase branches in electrical panels and distribution boards. It employs a thermal‑magnetic trip mechanism with a K‑curve characteristic to manage normal operation inrush while providing solid short‑circuit protection, with a 10 kA interrupting capacity at 240 V. This bolt‑on device is intended for AC use only and carries the safety approvals associated with ABB’s System pro M Compact line, including UL/CSA/IEC listings, making it suitable for industrial and commercial installations that require dependable overcurrent protection in compact form. As part of ABB’s S200 U family, the S203U-K10 is one of the compact, molded‑case breakers designed to integrate with other members of the line for coordinated protection in multi‑branch panels and control gear. The 3‑phase design supports balanced loads common in motors, pumps, fans, and other equipment typically protected at the distribution level, ensuring reliable disconnection during overloads or faults while maintaining service continuity in non‑faulted legs.