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Square D KA26100AC Molded Case Circuit Breaker
- 100A
- 2 Pole
- I-Line
Square D
KA26100AC
Molded Case Circuit Breaker
Brand
Square D
SKU
KA26100AC
Quantity
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Square D KA26100AC - 100A 2 Pole Molded Case Circuit Breaker
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Description
The KA26100AC is a 2-pole, 100A MCCB from Square D's legacy K-Frame lineup. Built for industrial applications, it delivers reliable long-time and instantaneous (LI) protection. This breaker installs into Square D I-Line panelboards using an A-C phase connection. For modern upgrades, it is replaced by the PowerPact HGA261002. Rated 25 kAIC at 480VAC, it features an adjustable magnetic trip to accommodate varying inrush currents. It is HACR rated and includes a Visi-Trip indicator.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA26100AC |
| Series | KA |
| Amperage | 100A |
| 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-C |
| 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 type of panelboards is the Square D KA26100AC compatible with?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features a plug-in mounting style specific to the I-Line system.
What does the "AC" suffix indicate in the KA26100AC catalog number?
The "AC" suffix specifies the phase connection for the I-Line bus. This 2-pole breaker is configured to connect to the A and C phases of the panelboard.
What wire sizes and materials are accepted by the lugs on the KA26100AC?
The terminal lugs on this breaker accept wire gauges from 4 AWG up to 350 kcmil. They are rated for both aluminum (Al) and copper (Cu) conductors.
Are the trip settings on the KA26100AC adjustable?
This breaker features a thermal-magnetic trip unit with a fixed thermal element for long-time overload protection and an adjustable magnetic element for instantaneous short-circuit protection.
How does the interrupting capacity (AIC) scale across different AC voltages for this breaker?
The KA26100AC provides a maximum interrupting capacity of 42kAIC at 240VAC. As system voltage increases, the rating steps down to 25kAIC at 480VAC and 22kAIC at 600VAC.
Can the KA26100AC be used in direct current (DC) applications?
Yes, this circuit breaker is rated for DC applications up to 250VDC, with an interrupting capacity of 10kAIC at that voltage.
Is the KA26100AC a current production model or a legacy breaker?
The KA frame is a legacy molded case circuit breaker (MCCB). While it is no longer the primary active series, it remains widely used in existing I-Line installations. Modern replacements typically fall under the PowerPact H-frame series.
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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.