Siemens 5SX21C1,6-277VAC-1P Molded Case Circuit Breaker

Siemens 5SX21C1 is a one-pole molded-case circuit breaker rated for 277 VAC with a 6 A current rating, intended to provide overcurrent protection for a single-phase branch circuit in commercial and light industrial electrical systems. The device belongs to Siemens’ 5SX family of molded-case breakers and is designed to interrupt fault currents on 277-volt distribution networks, helping protect wiring, devices, and control circuits from overloads and short circuits. The "C1" designation identifies this 1-pole variant in the 5SX21 line, aligning with the 277 VAC, 6 A specification described in retailer and distributor product listings. Typical applications include 277 V lighting and control circuits in commercial buildings, where compact, reliable protection is required within a panelboard or enclosure. The 5SX21C1 is a compact, robust solution for overcurrent protection on 277 VAC systems, reflecting Siemens engineering and compatibility with other components in the Siemens protection ecosystem.