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Cross-Reference · Circuit Breakers

Eaton / Cutler-Hammer Circuit Breaker Cross-Reference

Eaton (and its Cutler-Hammer and Westinghouse lineage) has retired generations of molded-case breakers — the EHD, GHB, FD / HFD, and KD / HKD Series C frames among them. The modern path is Eaton's current molded-case line (Series C continuations and the Power Defense / PXR family) selected by amp and interrupting rating. For every frame, Edmundson Industrial sources new-surplus, used-tested, and reconditioned breakers so you can drop in the original or retrofit to current.

Legacy frame → modern replacement

Legacy frameAmp rangeCurrent pathExample catalog
EHD (E-frame)to 100 ACurrent Eaton / Power DefenseEHD3020
GHB (G-frame)to 100 ACurrent Eaton G-frameGHB3030
FD / HFD (F-frame, Series C)to 225 ACurrent Eaton F-frame / Power DefenseFD3100, HFD3100
KD / HKD (K-frame, Series C)to 400 ACurrent Eaton K-frame / Power DefenseKD3250

Amp ranges are nominal — the catalog number encodes poles, voltage, amp rating, and interrupting class. Confirm against the nameplate before substituting.

Reading a Eaton / Cutler-Hammer catalog number

Eaton catalog formats vary by series (Series C and earlier Westinghouse-derived numbers differ), but the letters identify the frame and interrupting class and the trailing digits give poles and amp rating. The H prefix (HFD, HKD) marks the higher-interrupting version of the frame — match or exceed the original interrupting rating, not just the amp rating.

CatalogFrame / typeNotes
FD3100F-frame, Series C3-pole, 100 A; HFD3100 is the high-AIC version
KD3250K-frame, Series C3-pole, 250 A; HKD is the high-AIC version
GHB3030G-frame branch3-pole, 30 A; common 277/480 V breaker
EHD3020E-frame3-pole, 20 A

Demand lives on the surplus market

Industrial Eaton / Cutler-Hammer numbers like FD3100, HFD3100, KD3250, and GHB3030 are low-volume on Google but high-intent, with steady secondary-market liquidity. For obsolete breakers, marketplace availability — not search traffic — is the real demand signal, which is why we compete on stock and sourcing speed.

Drop-in original or retrofit?

A surplus original keeps a panelboard or MCC bucket exactly as-built. A current Eaton frame (Series C or Power Defense) is the long-term path but can change the footprint, especially across series. When it does, our fabrication side makes the adapter brackets and filler plates so the new breaker fits the old opening — part and panel on one PO.

FAQ

Are Eaton / Cutler-Hammer breakers like FD and KD obsolete?
Many legacy Series C frames (EHD, GHB, FD / HFD, KD / HKD) are mature or discontinued. New-surplus, used-tested, and reconditioned units remain available through Edmundson Industrial, and we cross-reference to current Eaton frames.
What replaces an Eaton FD or KD breaker?
Current Eaton molded-case frames (Series C continuations or Power Defense) by amp and interrupting rating. We also source the original FD / KD surplus to keep a panel as-built.
Can you source a specific number like FD3100 or KD3250?
Yes — these are common industrial catalog numbers on the surplus market. Send the exact string and we'll quote new-surplus, used-tested, or reconditioned with condition disclosed.
Do you handle Cutler-Hammer and Westinghouse too?
Yes — Cutler-Hammer and Westinghouse molded-case lines are part of the same Eaton lineage. We source and cross-reference all three.
Will a current Eaton breaker fit my old panel?
Often, but footprints changed across series. Our fabrication side makes adapter and filler hardware so a current breaker fits the legacy opening.

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or send the catalog number off the breaker to sales@edmundsonindustrial.com · (832) 975-8827 · Houston, TX. Same-day response on most requests.

Related cross-reference pages

Send the catalog number off the breaker.

Condition disclosed before sale. Same-day response on most requests.

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