Siemens BQD340N Three-Phase Molded Case Circuit Breaker

Siemens BQD340N is a three-pole molded-case circuit breaker in the BQD family, rated for 40 A and designed for three‑phase distribution in industrial and commercial panels. It provides thermal‑magnetic protection with an interrupting rating of 14 kA at up to 480 VAC, making it suitable for short‑circuit protection on feeders and motor circuits. The unit uses bolt‑on mounting for secure installation in compatible Siemens panels, and it is rated for operation on 50/60 Hz systems. The three‑pole configuration supports common applications such as protection of motors, pumps, HVAC equipment, and other loads in distribution boards or switchgear, with molded‑case construction for durability and consistent trip characteristics. This model delivers a straightforward, code‑compliant means to safeguard conductors and equipment in standard 480 V three‑phase networks.