Siemens QP340U Three-Phase Molded Case Circuit Breaker

The Siemens QP340U is a three-pole molded‑case circuit breaker in the QP/MP family, designed for plug‑in installation in distribution panels. It is rated for 40 A at 240 V AC and features a thermal‑magnetic trip with a 10 kA short‑circuit interrupt rating, suitable for protecting three‑phase feeders. This UL 489 listed device supports 120/240 V systems and is intended for electrical distribution applications such as load centers and panelboards. As part of Siemens’ QP/MP molded‑case line, the QP340U provides three‑phase protection in panelboards and main feeders where three‑phase protection is required.