ABB S272-K4A Circuit Breaker

ABB S272-K4A is a two-pole molded-case circuit breaker (MCCB) in the S272 family, engineered for DIN-rail mounting inside low-voltage distribution panels. It is rated for 4 A and supports 277/480 VAC service, with a Type K (K-curve) magnetic trip intended for fast response to short circuits and to handle motor inrush conditions common in commercial and light-industrial installations. The device is designed for plug-in DIN-rail installation and offers compact protection for branch circuits in control panels, panel boards, and other enclosures that follow standard ABB S272 form factors. Across multiple distributors and ABB-related listings, the S272-K4A appears as a 2P, 4 A, 277/480 V MCCB with K-curve characteristics, reinforcing its role as a widely used, DIN-rail protection device in modern electrical installations. Because it is part of ABB's legacy S272 lineup, it integrates with ABB accessories and offers a compact footprint suitable for dense panel layouts.