Free Shipping Over $99
Square D KA26175AC Molded Case Circuit Breaker
- 175A
- 2 Pole
- I-Line
Square D
KA26175AC
Molded Case Circuit Breaker
Brand
Square D
SKU
KA26175AC
Quantity
Shop with Confidence
Add an extra year of protection in your cart.
Square D KA26175AC - 175A 2 Pole Molded Case Circuit Breaker
New
Quantity
Similar Items
150A 2 Pole Molded Case Circuit Breaker
225A 2 Pole Molded Case Circuit Breaker
125A 2 Pole Molded Case Circuit Breaker
Description
A robust solution for industrial facilities, the Square D KA26175AC is a 2-pole, 175-amp MCCB. It employs proven thermal-magnetic technology, combining fixed thermal protection with an adjustable magnetic trip. Designed for Square D I-Line panelboards, it features a plug-on mounting style with a factory-configured A-C phase connection. For facilities planning upgrades, this legacy K-Frame model crosses over to the JGA261752. The unit boasts a 25 kAIC rating at 480VAC and is HACR rated.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26175AC |
| Series | KA |
| Amperage | 175A |
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, IEC, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
7 answersWhat does the "AC" suffix mean in the KA26175AC catalog number?
In Square D I-Line circuit breakers, the "AC" suffix indicates the factory-configured phase connection. This 2-pole breaker is designed to connect specifically to the A and C phases on the panelboard bus.
Can this 2-pole breaker be installed in a 3-phase I-Line panelboard?
Yes. While the KA26175AC is a 2-pole breaker, it is fully compatible with 3-phase Square D I-Line panelboards and switchboards. It will draw power from two of the three available phases, which are the A and C phases.
Is the Square D KA frame still in active production?
The KA frame is a legacy K-Frame product. While it is still sourced for direct replacements in existing I-Line panels, Square D has transitioned to the PowerPact J-Frame, such as the JGA261752, for modern 175A applications.
What wire sizes are accepted by the lugs on the KA26175AC?
The standard load-side lugs accept 4 AWG through 350 kcmil aluminum or copper conductors.
How does the adjustable magnetic trip function work on this breaker?
The KA26175AC features a thermal-magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic element for short-circuit protection. The magnetic trip threshold can be adjusted to coordinate with downstream loads and prevent nuisance tripping.
Does the KA26175AC provide ground fault or arc fault protection?
No. This is a standard thermal-magnetic circuit breaker designed strictly for overload and short-circuit protection. It does not include GFCI or AFCI capabilities.
How does the I-Line plug-in connection work?
The I-Line mounting style features factory-set plug-in jaws that attach directly onto the bus stack of the panelboard. The breaker is then secured in place with a retaining screw, which eliminates the need to manually assemble connectors to the bus bar.
SuperClub
Join free. Get 500 SuperPoints.
Earn points on eligible purchases and redeem them at checkout.
100 SuperPoints = $1 off.
Warranties
Add an extra year of protection
60-Day Warranty
Your purchase includes 60 days of SuperBreakers warranty coverage.
Add a 1-year warranty extension in your cart.
Get a Quote
Don’t see what you’re looking for?
We source obsolete and hard-to-find parts every day.
Shipping
Free Shipping Policy
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.
Same Day Shipping
We strive to ship out your items the same day the order is placed. In rare circumstances SuperBreakers may reserve up to 5 business days to consolidate orders for complete shipment.
Expedited Shipments
Orders being shipped via Next Day Air, 2 Day Shipping or 3 Day Shipping must be received by 3 PM EST to guarantee same-day shipments. Expedited orders only ship on normal business days. Shipments will NOT be sent out on Saturdays and Sundays.
International Shipping
All International orders require a $1,000 minimum order threshold. Due to the special nature of these shipments, we require that these be placed with a SuperBreakers representative. Additional shipping and instructions will apply. All International Orders are Non-Cancel and Non-Refundable.
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
Search
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.