Siemens QJ23B225H U Three Phase 240V AC Contactor

Siemens QJ23B225H U is a three-pole molded case circuit breaker (MCCB) in the QJ frame family, rated for 225 A at 240 V AC with a 42 kA short-circuit interrupting capacity at 240 V. It uses load-lug terminations for line and load connections and accepts copper conductors from 6 AWG up to 300 kcmil or aluminum conductors from 4 AWG up to 300 kcmil, enabling flexible wiring in panelboards and switchgear. The device measures roughly 4.5 in wide by 7 in tall by 2.53 in deep and carries UL 489 and CSA C22.2 certifications, ensuring compliance for industrial power distribution installations. With a thermal-magnetic trip mechanism, this 3P MCCB provides reliable overcurrent protection for 240 V three-phase systems, commonly used to safeguard feeders, motors, and other industrial equipment in manufacturing, processing, and large commercial facilities.