Siemens BQD345 N Molded Case Circuit Breaker MCCB

Siemens BQD345 N is a three‑pole molded‑case circuit breaker (MCCB) in the BQD family, engineered to protect 3‑phase circuits in commercial and industrial power distributions. With a 45 A continuous rating and a 277/480 V AC operating voltage, it delivers a 14 kA interrupting capacity at 480 V, enabling fast clearance of fault currents in demanding installations. Its thermal‑magnetic trip mechanism provides reliable overload protection plus short‑circuit relief, helping safeguard feeders and panelboards while meeting typical protection requirements for 3‑phase systems. The compact BQD345 N is designed for panel mounting in standard low‑voltage distribution setups and complements Siemens’ MCCB lineup for reliable, scalable protection in 277/480 VAC networks. As part of Siemens’ BQD family, the BQD345 N is positioned for 3‑phase protection in commercial and light industrial installations, offering a balance of compact footprint and solid interrupting capacity for feeders to lighting and other branch circuits within 277/480 VAC distribution schemes.