Cutler-Hammer Discontinued Breaker Replacement: Eaton Series C Cross-Reference

Who Makes Cutler-Hammer and Westinghouse Breakers Now?

Eaton does. Eaton acquired the Cutler-Hammer business and, in 1994, took over Westinghouse's electrical distribution and control business. It consolidated those legacy molded-case lines into what is now the Eaton Series C family, and it has since folded the Cutler-Hammer name into the Eaton brand.

For a plant engineer, the key point is that the OEM lineage is unbroken. There is an official successor for almost every legacy frame, and Series C breakers were designed to fit many existing Westinghouse and Cutler-Hammer panelboards and switchboards. A discontinued breaker usually does not force a whole-panel replacement. You cross-reference to the current Series C equivalent, or you source the original. Browse our circuit breakers in stock when you are ready.

Cutler-Hammer / Westinghouse to Eaton Series C Cross-Reference

Navigating the legacy catalog comes down to the frame letter and the ampere rating. Eaton carried the same frame letters forward: an old F-frame becomes an Eaton FD, a K-frame becomes a KD, and so on. An "H" prefix denotes a higher interrupting rating (FD versus HFD, KD versus HKD). Use the frame letter to find your row, then confirm the exact rating.

The designators and example part numbers above are a starting map, not a finished part number. The exact Series C catalog number also depends on interrupting rating, poles, and trip type. Verify against Eaton's current cross-reference, or send us the legacy number and we will return the exact match.

The Five Checks That Turn a Frame Into a Part Number

 The chart tells you which Series C frame to look at. To land on the correct part number, match these five items:

Get any one of these wrong and the breaker may fit but protect the circuit incorrectly. If you would rather not chase all five, send us the legacy catalog number and we will return the exact Eaton Series C match.

Common Cross-Reference Mistakes

The breaker frame alone is not a complete part number; it only narrows the search. Always verify the interrupting rating, as standard and high-interrupting versions are not interchangeable. Also, avoid swapping trip types, since replacing a Digitrip electronic unit with a basic thermal-magnetic breaker can change the equipment's protection behavior.

Check all accessories, including shunt trips, auxiliary contacts, and undervoltage releases, to ensure they are properly accounted for. Remember that physical fit does not guarantee a listed or approved combination, and never reconstruct a catalog number using incomplete or worn nameplate markings.

The Five Checks That Turn a Frame Into a Part Number

The chart tells you which Series C frame to look at. To land on the correct part number, match these five items:

• Exact ampere rating. The frame sets the ceiling. You still specify the trip rating within it.
• Interrupting rating (kAIC). Legacy breakers came in standard and high-interrupting versions. Match or exceed the available fault current at your voltage. An "H" prefix Series C frame is the higher-interrupting option.
• Trip type. Smaller frames are thermal-magnetic, while larger L, M, N, and R frames often use Digitrip electronic trip units. Replicate the behavior you have.
• Poles and voltage. Confirm 2-, 3-, or 4-pole construction and the system voltage.
• Mounting, connections, and accessories. Confirm fixed, plug-in, or drawout mounting, lug type, and any shunt trips, auxiliary contacts, undervoltage releases, or handle mechanisms.

When a Cross-Reference Needs a Second Look

Slow down and verify further in these situations:

• The nameplate is worn, painted over, or unreadable
• The breaker uses a Digitrip electronic trip unit with custom settings
• Available fault current is unknown or has changed
• The breaker is drawout, or has several accessories
• The equipment is a loadcenter rather than industrial gear
• The panel also contains fused switches, so you may want to review safety switches

Common Cross-Reference Mistakes

• Treating the frame as a finished part number. The frame only narrows the search.
• Ignoring the interrupting rating. Legacy standard and high-interrupting versions are not interchangeable.
• Swapping trip types. Replacing a Digitrip electronic unit with a basic thermal-magnetic breaker changes protection behavior.
• Overlooking accessories. Shunt trips, auxiliary contacts, and undervoltage releases have to be carried over.
• Assuming a physical fit means approval. A breaker that merely fits the bus is not automatically a listed or approved combination.
• Guessing from a worn nameplate. Never rebuild a catalog number from partial characters.

Get any one of these wrong and the breaker may fit but protect the circuit incorrectly. If you would rather not chase all five, send us the legacy catalog number and we will return the exact Eaton Series C match.

Have a discontinued Cutler-Hammer loadcenter instead? If you are holding an old residential or light-commercial loadcenter rather than industrial gear, the path is different from the molded-case cross-reference above. Legacy Cutler-Hammer Type CH and Type BR loadcenters each take their own breaker line, and Eaton Type BR breakers are also UL-listed for certain legacy Westinghouse, Challenger, and Bryant loadcenters. Eaton publishes details on its Classified Circuit Breakers page.

Photographing the Breaker Before Sourcing

Clear photos let a supplier identify the breaker quickly. The frame letter leads the catalog number (E, F, J, K, L, M, N, or R), sometimes with an interrupting prefix such as "H," and the characters that follow indicate poles and ampere rating.

When documenting a breaker, capture:

• Complete catalog number and frame letter
• Ampere rating, voltage, and number of poles
• Overlooking accessories. Shunt trips, auxiliary contacts, and undervoltage releases have to be carried over.
• Interrupting rating
• Trip unit face and settings
• Accessory markings
• Equipment nameplate
• Front, side, and rear views where safely accessible

If the nameplate is worn or painted over, do not guess. Send us a photo and we will identify it. Only qualified persons should work near energized equipment.

Three Ways to Solve a Discontinued Breaker 

Option three is usually unnecessary given Series C's backward compatibility. We can cross-reference the Eaton Series C part or supply the original from inventory, so one failed breaker does not turn into a full gear replacement. For help with condition terms, see our Square D I-Line breaker replacement guide, which covers a similar process for another legacy line.

What to do next

Before requesting a quote, gather the legacy catalog number or a clear nameplate photo, frame letter, interrupting prefix, ampere rating, voltage, number of poles, trip type, and settings. Also, note the mounting style, accessories, equipment nameplate, and panel label.

Include the required quantity, condition (new, new-surplus, reconditioned, or used), ship-to location, and required-by date. For related replacement research, read our Crouse-Hinds breaker replacement guide or consult UL Solutions for listing and classification questions.

Frequently asked