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Eaton / Westinghouse KA3150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Eaton / Westinghouse
KA3150
Molded Case Circuit Breaker
Brand
Eaton / Westinghouse
SKU
KA3150
Quantity
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Eaton / Westinghouse KA3150 - 150A 3 Pole Molded Case Circuit Breaker
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Description
Providing reliable 150-amp service, this legacy molded case circuit breaker is engineered for industrial power systems. It utilizes a thermal-magnetic mechanism equipped with an adjustable magnetic setting to fine-tune short-circuit protection. The bolt-on configuration integrates perfectly with older Westinghouse motor control centers and switchboards. Choosing this specific model prevents the hassle of modifying enclosure deadfronts to accommodate the KD3150 substitute.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | KA3150-R |
| Series | KA |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| 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, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| 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, HACR Rated |
Product FAQs
5 answersWhich panelboards are compatible with the KA3150 circuit breaker?
This bolt-on breaker is specifically designed to fit legacy Westinghouse CDP and FDP panelboards. It is also compatible with older Westinghouse switchboards and motor control centers that accept K-Frame breakers.
What type of wire can be used with the KA3150 terminals?
The factory-installed lugs accept both aluminum and copper (Al/Cu) conductors ranging from 4 AWG to 350 kcmil. Ensure your conductors are properly sized for a 150A load per the National Electrical Code (NEC).
How does the adjustable trip unit on the KA3150 work?
This breaker features a thermal-magnetic (LI) trip unit. The thermal element, which provides long-time overload protection, is fixed at 150 amps. The magnetic element, which provides instantaneous short-circuit protection, is adjustable, allowing you to fine-tune the trip response for your specific load requirements.
Is the KA3150 a direct replacement for older Westinghouse K-Frame breakers?
Yes, the KA3150 is a direct bolt-on replacement for legacy Westinghouse KA-type, 150A, 3-pole breakers. Using this exact model prevents the need to modify enclosure deadfronts or bus connections that might be required if upgrading to a newer Series C KD-frame substitute.
What is the maximum fault current rating for the KA3150 at 480V?
The KA3150 provides a 22kA interrupting capacity (AIC) at 480VAC. It is essential to verify that the available fault current at your installation point does not exceed this rating to ensure safe operation.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 14 reviews.
Total 5 star reviews: 13 Total 4 star reviews: 1 Total 3 star reviews: 0 Total 2 star reviews: 0 Total 1 star reviews: 0
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Rating
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.