Eaton / Cutler-Hammer JDC3125 Molded Case Circuit Breaker

This breaker is designed for use in Eaton Series C panelboards, switchboards, and motor control centers. It is also backward compatible with legacy Westinghouse enclosures that accept J-Frame breakers.

The JDC designation indicates an ultra-high interrupting capacity. While standard JD and high-interrupting HJD frames have lower fault current ratings, the JDC frame provides up to 100kAIC at 480VAC and 200kAIC at 240VAC for systems with high available fault currents.

It features a thermal-magnetic trip unit with a fixed thermal element for overload protection at 125A and an adjustable magnetic element. The adjustable magnetic dial allows you to set the instantaneous short-circuit pickup threshold to coordinate with downstream devices.

Yes. Eaton acquired the Westinghouse distribution equipment line. The modern Eaton Series C JDC3125 is a direct, drop-in replacement for the legacy Westinghouse breaker bearing the exact same catalog number.

It is a unit-mount circuit breaker. It bolts directly to the mounting pan or chassis rather than plugging into a busbar or snapping onto a DIN rail.

The factory lugs accept wire gauges from 4 AWG up to 350 kcmil. They are rated for both aluminum and copper conductors.

Yes, this breaker is rated for up to 250VDC with an interrupting capacity of 22kA. When installing in DC systems, ensure the wiring configuration complies with the manufacturer guidelines for DC pole connections.

Yes, Eaton Series C J-Frame breakers support a variety of internal accessories. These must be installed in the designated accessory pockets located under the front cover of the breaker.

No. The thermal-magnetic trip unit in this specific frame is factory sealed and cannot be swapped or serviced in the field. If the trip unit fails, the entire breaker must be replaced.