ABB S273K6A 3-Pole Circuit Breaker 277/480V AC

ABB S273K6A is a three-pole miniature circuit breaker designed for branch-circuit protection in 480Y/277 V electrical distributions. Rated at 6 A, it interrupts fault currents on all three phases and is specified for 277/480 V AC service, making it a common choice for commercial equipment fed from 480 V three-phase systems. The part is cataloged in ABB’s UL489 mini circuit breaker lineup as a 3P device with a 6 A rating, listed under the 2CDS273337R0377 family, which confirms its 480/277 V capability and three-pole configuration. As a compact, modular MCB, S273K6A fits standard low-voltage distribution schemes where precise overcurrent protection is required for small current-rated circuits operating on 277/480 V supplies. The K designation appearing in the model name denotes its trip characteristics as part of ABB’s K-type MCB offerings in this series, and this variant is specifically the 6 A version within the 3-pole S273K6A lineup. Suitable applications include protection of feeders and branch circuits for equipment and systems powered by 480Y/277 V, such as HVAC controls, lighting circuits, and other 3-phase loads in commercial or industrial environments where compact, reliable protection is essential.