Eaton / Cutler-Hammer HKD3225 Molded Case Circuit Breaker

Yes. Eaton acquired the Westinghouse distribution equipment business and continued manufacturing the Series C line. This Cutler-Hammer / Eaton HKD3225 is a direct drop-in replacement for legacy Westinghouse breakers with the exact same catalog number.

All three belong to the Eaton Series C K-Frame family and share the exact same physical dimensions and mounting footprint. They differ in their short-circuit interrupting ratings (AIC). KD is the standard tier, HKD is the high-interrupting tier, and KDC provides the highest interrupting capacity in this frame size.

As a Series C K-Frame device, this breaker is physically larger than F-Frame or J-Frame models. It is designed for installation in compatible Eaton and Cutler-Hammer switchboards, motor control centers, and panelboards that are specifically configured to accept K-Frame breakers.

Yes. This breaker comes complete with factory-installed line and load terminals. These standard K-Frame lugs are dual-rated for use with either copper (Cu) or aluminum (Al) conductors ranging from 3 AWG up to 350 kcmil.

The LI code indicates a thermal-magnetic trip unit with fixed Long-Time (thermal) overload protection and an adjustable Instantaneous (magnetic) short-circuit pickup. During installation, the instantaneous dial can be adjusted to coordinate the breaker's trip response with other protective devices in the system.

The standard HKD3225 is rated for 80 percent continuous operation, meaning the continuous load should not exceed 180 amps for three hours or more. If your application requires a 100 percent continuous rating, you would need the CHKD3225 version installed in a specifically approved enclosure.

Yes. The Eaton Series C K-Frame supports a variety of internal accessories, including shunt trips, auxiliary switches, undervoltage releases, and alarm switches. These are typically installed under the breaker's front cover in designated accessory pockets.