Square D KA26250BC Molded Case Circuit Breaker
- 250A
- 2 Pole
- I-Line
Quantity
Square D KA26250BC - 250A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Providing essential overcurrent safety, this 2-pole, 250A molded case circuit breaker operates within the Square D legacy K-Frame series. It utilizes thermal-magnetic trip technology to offer precise long-time and instantaneous protection. Built for quick installation, the unit snaps into Square D I-Line panelboards. While it remains a staple for maintaining existing setups, the JGA262504 acts as the updated substitute. Features a B-C phase connection and a 25kAIC interrupt rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26250BC-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: B-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
6 answersWhat is the modern replacement for the legacy KA26250BC circuit breaker?
The Square D KA26250BC is part of the legacy K-Frame series. The direct modern substitute is the PowerPacT J-Frame breaker, catalog number JGA262504, which matches the 250A rating, I-Line mounting, and B-C phase connection.
What does the BC suffix mean on this Square D breaker?
The BC suffix indicates the breaker is factory configured for a B-C phase connection. When plugged into an I-Line panelboard, its line-side jaws will specifically connect to the B and C bus bars.
Can this breaker be used in a single-phase I-Line panelboard?
Yes, but caution is required. This breaker is configured for a B-C phase connection. Since single-phase I-Line panelboards typically utilize the A and C phases from the factory, you must verify your specific panelboard bus configuration before installing this B-C breaker.
How does the KA26250BC mount into a panelboard?
This breaker features an I-Line style plug-in connection. The integral jaws snap directly onto the panelboard bus stack and are secured in place with a retaining screw, eliminating the need for separate wire connectors on the line side.
How does the trip adjustability work on the KA26250BC?
The breaker is equipped with a thermal-magnetic trip unit. The thermal element, which provides long-time overload protection, is fixed. However, the magnetic element is adjustable, allowing you to fine-tune the instantaneous short-circuit trip threshold for your specific application.
Is the KA26250BC suitable for HVAC equipment?
Yes, this circuit breaker is HACR rated, making it approved for use with heating, air conditioning, and refrigeration equipment.
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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.