Eaton / Westinghouse KA2100 Molded Case Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Quantity
Eaton / Westinghouse KA2100 - 100A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
A drop-in replacement for aging infrastructure, the Eaton KA2100 restores power to legacy Westinghouse systems. This 100A molded case circuit breaker ensures continued operation without requiring immediate panel upgrades. It mounts into classic CDP and FDP panelboards. While the modern KD2100 is a substitute, upgrading requires deadfront modifications due to differing handle positions. Choosing this original KA frame preserves the enclosure. It features a 25kAIC rating at 240VAC.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | KA2100-R |
| Series | KA |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 25kA @ 240VAC, 22kA @ 480VAC, 14kA @ 600VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse CDP Panelboards, FDP Panelboards, Switchboards, Motor Control Centers |
| Wire Gauge | 4 AWG - 350 kcmil (Al/Cu) |
| Max Wire | 350 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs |
| Standards | CSA C22.2 No. 5, NEMA AB-1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
6 answersWhich panelboards are compatible with the KA2100 circuit breaker?
This bolt-on breaker is designed for use in legacy Westinghouse CDP and FDP panelboards, as well as compatible switchboards and motor control centers.
What type of trip unit is installed in this KA series frame?
The KA2100 features an interchangeable thermal-magnetic trip unit, providing fixed thermal and fixed magnetic protection.
Is the KA2100 suitable for direct current systems?
Yes, this breaker is rated for DC applications up to 250VDC, providing a 10kA interrupting capacity for direct current circuits.
What wire sizes are accepted by the load side lugs?
The standard load side terminals accept both aluminum and copper conductors ranging from 4 AWG to 350 kcmil.
Why is this breaker listed under both Eaton and Westinghouse?
Westinghouse distribution equipment was acquired by Eaton Cutler-Hammer. The KA2100 is a legacy Westinghouse K-frame breaker that is now part of the Eaton legacy molded case circuit breaker family.
What protection functions are provided by the LI designation?
The LI trip function code indicates Long-Time and Instantaneous protection. This provides standard thermal overload protection (Long-Time) and immediate short circuit protection (Instantaneous).
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 14 reviews.
- RFRon F.Verified BuyerReviewingSquare D KA36150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/27/26Square D KA36150
As usual, on time and in great condition!
- SJShawn J.Verified BuyerReviewingSquare D KA36225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/27/26I Line BreKER
Found exactly what I was looking for. They called and set over specs so I could confirm the fit!
- RFRon F.Verified BuyerReviewingSquare D KA36100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars4/9/26Multiple orders
I have purchased multiple breakers (of fairly large size) from SuperBreakers and their pricing has been excellent and the delivery time spot on. I would highly recommend them
- MFMatt F.Verified BuyerReviewingSquare D KA36100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/21/25Order Messed Up - Breaker Great
I have ordered many breakers through SuperBreakers with no issues until this order. I ordered this breaker and it wasn't shipped. I sent a message and was told that a mistake was make in shipping and that they would next day air the breaker to me. 5 days later (weekend in there) the breaker arrived. Not next day air, but shit happens. Sent the breaker still in the box out with my electrician and received a call from him that the breaker that was sent was a KAL36100 not the KA36100. I reached out to SuperBreakers and was told the correct breaker would be next day aired that day and I was emailed a shipping label to send back the incorrect one. This time it arrived the next day and was installed. This error cost my customer a couple days with out power to a dimmer cabinet and about 2 extra hours of labor, but all was okay in the end. Mistakes happen. The help and quick responses to my emails I received from Mike David showed me enough about this company. I look forward to my next order. Thank you for working this situation out in timely manor.
- JHJoel H.Verified BuyerReviewingSquare D KA36200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/5/25Worked As Planned
They had what we needed to match existing equipment, they shipped the same day and we put it right into service, no problems from first phone call to delivery and install.