Siemens QP330 Molded Case Circuit Breaker 3-Pole 30A 240V

Siemens QP330 (often cataloged as Q330) Molded Case Circuit Breaker is a 3-pole, 30-amp, 240-volt protective device from Siemens’ QP family. This 3P MCCB provides thermal-magnetic overcurrent protection for branch circuits in commercial and residential panels that accept QP-type breakers. Rated at 240V AC and 30A, it guards feeders and loads such as lighting circuits and small motors within its 10 kA interrupting capacity at 240V, enabling safe interruption of faults typical in standard installations. As part of the Siemens QP line, the QP330 shares mounting geometry and electrical characteristics with other QP devices, supporting reliable replacement and expansion in compatible panelboards and load centers. In practice, it is used to protect 240V circuits in distribution panels that specify Siemens QP breakers, offering a standard 30A protective solution for residential and light commercial wiring where a compact, reliable molded-case breaker is required.