KCJ34225

The KCJ34225 is a Square D K-frame molded case circuit breaker rated for 225 amps at 480 volts with 3 poles, designed to protect feeder and branch circuits in industrial and commercial power distribution. With an interrupting rating of 65kA@480V, it can safely interrupt the very high fault currents found on large industrial systems. The KC is the extra-high interrupting version of the K-frame, which makes it a good fit where the available fault current is high. The KCJ34225 uses a thermal-magnetic trip that provides long-time and instantaneous protection. The thermal element responds to sustained overloads, while the magnetic element trips instantly on a short circuit, so the breaker can clear a fault quickly and still tolerate the brief surges that equipment draws at startup. Square D builds its molded case breakers with a push-to-trip button and a visual trip indicator, which make testing and troubleshooting easier. The letter “J” in the catalog number identifies the terminal and mounting configuration of this K-frame breaker, which differs from the KCL version that has lugs on both ends. Because Square D builds this breaker in several configurations, it is worth confirming the full part number, frame, amp rating, and terminal configuration against your equipment before ordering. This makes the KCJ34225 a practical choice for electricians and maintenance teams who need to replace a Square D K-frame breaker in an existing switchboard, panelboard, or enclosure and keep the system running.