ABB ST203M-K15 Soft Starter For Three Phase Motors

ABB ST203M-K15 is a three‑pole miniature circuit breaker (MCB) from ABB’s ST200M family, intended to protect three‑phase circuits in electrical panels by interrupting fault currents and overloads. The North America variant ST203M-K15NA is rated at 15 A and follows a Type K (curve) trip characteristic, with UL 1077 listing for supplementary protection in compatible installations. This 3P, 15A device provides reliable overcurrent protection for distribution boards, motor control panels, and other three‑phase applications where compact, replaceable protection is required. The ST200M family is designed for quick installation and interchangeability with standard MCCB/MCC components in many low‑voltage switchgear configurations. Key verified specifications for this model include 3 poles, nominal current 15 A, Type K trip curve, and UL 1077 listing. Used across industrial control panels, distribution boards, and equipment requiring rapid, selective protection, the ST203M-K15NA integrates with other protective devices to help maintain system uptime.