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Square D KA26150AB Molded Case Circuit Breaker
- 150A
- 2 Pole
- I-Line
Square D
KA26150AB
Molded Case Circuit Breaker
Brand
Square D
SKU
KA26150AB
Quantity
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Square D KA26150AB - 150A 2 Pole Molded Case Circuit Breaker
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Description
Built for heavy-duty applications, the Square D KA26150AB is a 2-pole, 150A molded case circuit breaker. It utilizes thermal-magnetic trip technology to deliver reliable long-time and instantaneous (LI) protection. This K-frame breaker mounts into Square D I-Line panelboards, featuring a factory-configured A-B phase connection. For modern upgrades, this legacy model is replaced by the PowerPact J-frame (JGA261501). With a 25kAIC rating at 480VAC, it includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26150AB-R |
| Series | KA |
| Amperage | 150A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC, 600Y/347VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 25kA @ 480Y/277VAC, 25kA @ 480VAC, 22kA @ 600Y/347VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| Frame Type | KA |
|---|---|
| Terminal Type | Lugs |
| For Use With | Square D I-Line Panelboards and Switchboards |
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Phase Connection A-B (Factory Configured) |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat does the "AB" suffix mean on the KA26150AB breaker?
The "AB" indicates the factory-configured phase connection. The line-side jaws are arranged to plug specifically into the A and B phases of a Square D I-Line panelboard or switchboard bus.
What is the modern replacement for the legacy KA26150AB?
The Square D KA frame is a legacy series. For modern panelboard upgrades, this 150A K-frame is typically replaced by the newer PowerPact J-frame series, specifically catalog numbers like JGA261501, which also utilize the I-Line mounting standard.
What is the magnetic trip adjustability range for this 150A breaker?
This thermal-magnetic breaker features a fixed thermal element and an adjustable magnetic trip unit. The instantaneous magnetic trip can be adjusted between 750A and 1500A to coordinate with downstream devices and specific fault current requirements.
How is the KA26150AB secured inside the panelboard?
It uses an I-Line plug-on connection. The line side features spring-reinforced jaws that press directly onto the I-Line bus assembly, while the breaker body is secured to the panelboard mounting pan with a retaining bracket. The load side utilizes mechanical lugs for wire termination.
Can this breaker be installed in a standard Square D NQ or NF panelboard?
No. The KA26150AB is exclusively designed for Square D I-Line panelboards and switchboards. It will not fit in NQ, NF, QO, or Homeline panels, which require different breaker frame types and mounting configurations.
How can an electrician easily identify if the KA26150AB has tripped?
This breaker features a Visi-Trip indicator. When the breaker trips due to an overcurrent or short-circuit condition, the handle moves to a center position and a highly visible red indicator appears, allowing for quick identification of the faulted circuit in a crowded panelboard.
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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.