Siemens QJ23S225A Molded Case Circuit Breaker

Siemens QJ23S225A is a three-pole molded-case circuit breaker from the QJ frame family, rated for 225 A at 240 V AC. It is designed for bolt-on mounting in compatible Siemens panels and distribution gear, delivering a 10 kA short-circuit rating at 240 V to protect feeders, motors, and large loads in commercial and industrial power circuits. As a 3P MCCB, it interrupts all three phases on fault and provides manual switching for serviceability within enclosed switchgear. The device protects three-phase circuits up to 225 A and is intended for use in 240 V systems, making it suitable for motor starters, process equipment, and large distribution feeders where compact, high-current protection is required. When selecting a QJ frame breaker, ensure the mounting configuration, enclosure, and interrupting rating match your panel and system fault current, and that the 240 V AC rating corresponds to your load and supply arrangement.