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Square D KA26250AB Molded Case Circuit Breaker
- 250A
- 2 Pole
- I-Line
Square D
KA26250AB
Molded Case Circuit Breaker
Brand
Square D
SKU
KA26250AB
Quantity
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Square D KA26250AB - 250A 2 Pole Molded Case Circuit Breaker
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Description
Built for commercial power systems, the Square D KA26250AB is a 2-pole, 250A MCCB delivering robust long-time and instantaneous protection. Designed for Square D I-Line panelboards, it features a factory-configured A-B phase connection. It is replaced by the PowerPact JGA262501. Rated for 600VAC with a 25kAIC capacity at 480V, it ensures dependable fault clearing. It also incorporates an adjustable magnetic trip and a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26250AB-R |
| Series | KA |
| Amperage | 250A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 42kA @ 240VAC, 25kA @ 480VAC, 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, Undervoltage Release, Alarm Switch |
|---|---|
| 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
5 answersWhat does the "AB" suffix mean on the KA26250AB circuit breaker?
The "AB" suffix indicates the factory-configured phase connection. When installed in a Square D I-Line panelboard or switchboard, this 2-pole breaker will specifically draw power from the A and B phases of the busbar system.
What is the modern replacement for the legacy KA26250AB?
The K-Frame series is a legacy product. For new installations or modern panel upgrades, Square D has replaced this model with the PowerPact J-Frame series, specifically catalog number JGA262501 for a 250A, 2-pole A-B phase I-Line configuration.
How does the KA26250AB mount into a panelboard?
It utilizes an I-Line style plug-in connection. This design allows the breaker's jaws to push directly onto the busbar of compatible Square D I-Line panelboards, eliminating the need for bolted bus connections and speeding up installation.
Does the KA26250AB feature adjustable trip settings?
Yes, while the thermal overload protection is fixed at 250 amps, the magnetic short-circuit trip setting is adjustable. This allows electricians to fine-tune the instantaneous response to coordinate with other protective devices in the electrical system.
What does the "LI" trip function code mean on this breaker?
"LI" stands for Long-Time and Instantaneous trip functions. The Long-Time function provides delayed tripping for sustained overloads, while the Instantaneous function immediately clears severe short circuits, ensuring comprehensive thermal-magnetic protection.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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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.