ABB ST 203M-C40 2CDS 273 334 R0404 Circuit Breaker

ABB ST203M-C40 is a three-pole miniature circuit breaker from ABB's ST200M family, rated 40 A with a C-curve trip characteristic, designed to protect three‑phase circuits up to 400 V AC. The unit carries catalog code 2CDS273334R0404 and provides a short-circuit breaking capacity of 10 kA, making it suitable for branch and distribution protection in commercial and light-industrial panelboards. With an IP20 enclosure, it is intended for indoor, panel-mounted installations. Typical applications include protecting three-phase power feeds to motors, transformers, and other equipment in electrical distribution systems, ensuring quick disconnection under overcurrent events while maintaining selectivity with neighboring devices.