Siemens QJH23B150 Three Pole Shunt Trip Circuit Breaker

The Siemens QJH23B150 is a three-pole, 150 A molded-case circuit breaker from the QJ frame (QJH2) family, rated for 240 VAC with a 22 kA short-circuit current rating at 240 V. It ships as a shunt-trip model with a 120/240 V remote trip capability, enabling automatic tripping from a control circuit and supporting safety interlocks or emergency shutdown schemes. The device uses a thermal-magnetic trip mechanism with defined long-time and instantaneous trip characteristics to protect wiring and equipment from overloads. Mounting is bolt-on, and the unit includes load-side lug terminals for wiring into Siemens panel buses. This configuration is suitable for three-phase distribution panels, motor feeders, and other industrial applications where remote-trip safety and reliable overcurrent protection are required, even in demanding industrial environments. Designed for 240 V three-phase service entrances and branch circuits, it enables selective protection in panels where remote trip is needed for safety interlocks or emergency shutdowns.