Siemens BQD340 Molded Case Circuit Breaker 3 Pole

Siemens BQD340 is a three‑pole molded‑case circuit breaker rated for 40 A in 480Y/277 VAC systems, catalog number BQD340. As part of Siemens’ BQD/CQD family, this thermal‑magnetic MCCB provides overcurrent protection for 3‑phase feeders within panelboards and switchgear. It carries an interrupt rating of 14 kA (Icu) at the 480Y/277 VAC rating, enabling it to safely interrupt fault currents typical in commercial and light‑industrial installations. The unit is designed for 3‑phase, 4‑wire networks and is used to protect branch circuits and essential loads, such as motor feeders, lighting, and distribution circuits. With its 40 A rating, 480Y/277 VAC compatibility, and 14 kA Icu, the BQD340 offers reliable, code‑compliant protection for medium‑sized loads in modern electrical distribution systems.