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Square D KA26250AC Molded Case Circuit Breaker
- 250A
- 2 Pole
- I-Line
Square D
KA26250AC
Molded Case Circuit Breaker
Brand
Square D
SKU
KA26250AC
Quantity
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Square D KA26250AC - 250A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D KA26250AC - 250A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | KA26250AC-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-C (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 |
Quantity
Square D KA26250AC - 250A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | KA26250AC-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-C (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 |
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Description
Utilizing a thermal-magnetic trip, the Square D KA26250AC is a 2-pole, 250A MCCB from the legacy K-Frame family providing long-time and instantaneous protection. Engineered for Square D I-Line panelboards, this unit features an A-C phase connection. For infrastructure upgrades, it is replaced by the PowerPact JGA262502. Capable of handling 600VAC, it offers a 25kAIC rating at 480V. The breaker is HACR rated and includes an adjustable magnetic trip and a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26250AC-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-C (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
7 answersWhat panelboards are compatible with the KA26250AC circuit breaker?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It utilizes a plug-on phase connection to the busbar and a screw-on bracket for secure mounting.
What does the "AC" suffix indicate in the KA26250AC catalog number?
The "AC" suffix denotes a factory-configured A-C phase connection. This means the 2-pole breaker will draw power specifically from the A and C phases when plugged into an I-Line panelboard bus.
How does the I-Line connection on the KA26250AC mount to the panelboard?
The breaker utilizes a plug-on design that connects directly to the I-Line busbar for power, combined with a screw-on mounting bracket that secures the breaker to the panelboard chassis.
What is the recommended wire binding screw torque for the AL250KA lugs on this breaker?
The factory AL250KA mechanical lugs require a tightening torque of 250 lb-in (28.2 N-m) for the wire binding screws. Always verify with the label on the breaker before terminating conductors.
What is the modern replacement for the legacy KA26250AC circuit breaker?
The legacy K-frame series has been superseded by the modern PowerPact J-frame series. When upgrading infrastructure, a J-frame MCCB with an I-Line connection is the standard replacement, but exact panelboard fitment and phase configurations must be verified.
How do you adjust the magnetic trip settings on this breaker?
The KA26250AC features a fixed thermal element for overload protection and an adjustable magnetic element for short-circuit protection. The magnetic trip threshold can be adjusted using the dial on the face of the breaker to coordinate with downstream devices and prevent nuisance tripping.
Does the KA26250AC feature a visual trip indicator?
Yes, this breaker is equipped with the Square D Visi-Trip indicator. When the breaker trips due to an overcurrent or short-circuit fault, the handle snaps to a midpoint position and a highly visible red indicator appears, allowing electricians to quickly identify the faulted circuit.
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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.