Siemens B350 Miniature Circuit Breaker

Siemens B350 Miniature Circuit Breaker is a 50-amp, 3-pole device from the Siemens BL-series, designed for panelboard branch-circuit protection in commercial and light-industrial electrical installations. It is a molded-case circuit breaker rated for 240V AC with a 10 kA short-circuit interrupting capacity at 240V, providing robust protection against overloads and faults while allowing quick, reliable tripping. The B350's three-pole configuration supports multiwire circuits and coordinated protection for downstream feeders, and it is compatible with standard BL-series mounting and Siemens enclosure systems used in modern distribution panels. In practice, engineers specify the B350 for general-purpose protection on 240V circuits up to 50A in Siemens panel environments, where a compact, reliable overcurrent protection device is required for protection of 50A feeders and downstream circuits.