Eaton / Cutler-Hammer HKD3400 Molded Case Circuit Breaker

Yes, this breaker is rated for DC applications up to 250VDC, offering a 22kA interrupting capacity for DC electrical systems.

You can adjust the instantaneous magnetic short-circuit response, but the thermal overload (long-time) trip point is fixed at 400 amps.

Yes, the HKD3400 is a direct physical replacement for standard KD3400 breakers because both share the Series C K-frame footprint. As a high-interrupting variant, the HKD3400 provides superior short-circuit protection (65kA versus 35kA at 480VAC) and is a safe electrical upgrade.

No, standard line and load side lug terminals are included with the breaker and will accept copper or aluminum wire sizes ranging from 250 kcmil to 500 kcmil.

No, this is a standard 80% rated breaker. In accordance with the National Electrical Code (NEC), standard continuous loads (running for three hours or more) should not exceed 320 amps.

No, this specific breaker features a non-interchangeable thermal-magnetic trip unit. If your application requires an electronic Digitrip unit, you must build a breaker using a separate K-frame base (such as the HKD3400F) paired with a compatible interchangeable electronic trip unit.

Yes. Because Eaton acquired the Westinghouse distribution equipment division, current Eaton Series C K-frame breakers serve as direct physical replacements for older Westinghouse K-frame breakers. This allows you to install the HKD3400 into legacy Westinghouse panelboards, switchboards, and motor control centers.

Yes, if you need to distribute power to multiple loads from a single terminal, Eaton manufactures compatible K-frame multi-wire connector kits (such as catalog numbers 3TA400K3K or 3TA400K6K) that can be installed on the load end.