Siemens QJ23B225U Molded Case Circuit Breaker MCCB

Siemens QJ23B225U is a three-pole molded-case circuit breaker (MCCB) in the QJ frame designed to protect 3‑phase circuits at 240 V. It is rated for 225 A of continuous current and provides a 10 kA interrupting capacity at 240 V, enabling safe disconnection of fault currents in light‑ to heavy-industrial power distribution. This thermal‑magnetic MCCB features long‑time and instantaneous trip functions to coordinate protection for feeders and equipment and is intended for use in panelboards and switchgear that accept QJ‑series devices. With the compact QJ frame and 3P configuration, it serves as a reliable protection device for motors, conveyors, and other 3‑phase loads in commercial and industrial installations. When selecting a replacement or expansion, match the current rating and interrupting capacity to your system requirements and verify compatibility with your Siemens panels or enclosures that accept QJ-series breakers.