Siemens B350HH U Three-Phase Molded Case Circuit Breaker

Siemens B350HH U is a three‑pole, 50 A molded‑case circuit breaker designed for panelboard mounting in 240 V AC three‑phase distribution systems. It uses a thermal‑magnetic trip mechanism and provides a 65 kA interrupt capacity at 240 V, enabling fast, reliable interruption of short circuits on feeders and motor circuits. The unit is panel‑mounted (bolt‑on) with common‑trip operation across all three poles, making it suitable for protecting 3‑phase feeders, motors, pumps, and HVAC equipment in commercial and light industrial installations, where dependable protection and quick replacement are valued. As part of Siemens' B‑series molded‑case breakers, the B350HH U aligns with standard 3‑phase layouts found in many industrial and commercial panels, and its 240 V AC rating matches typical infrastructure in North American facilities. Its robust thermal‑magnetic design supports frequent switching and fault protection while maintaining compact form factor designed for panelboard integration and straightforward field service.