ABB S273-K20 Molded Case Circuit Breaker

ABB S273-K20 Molded Case Circuit Breaker is a three‑pole, 20‑amp molded‑case protective device intended for DIN‑rail mounting in distribution panels. It is rated for up to 480 VAC, including 277/480 VAC three‑phase service, and employs ABB’s K‑curve trip characteristic to provide reliable protection against overloads and short circuits on all three poles. The S273‑K20 designation identifies a 3P, 20A model within ABB’s S273 family, offering a compact form factor suitable for modular protection in industrial and commercial installations. The device is designed for DIN rail installations in standard enclosures, enabling straightforward integration with other protective devices and control components. Typical applications include protection of three‑phase feeders in building distribution panels, switchgear, and machine control enclosures where a 20 A rating and 277/480 VAC supply are present.