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Square D KA36150MT Molded Case Circuit Breaker
- 150A
- 3 Pole
- I-Line
Square D
KA36150MT
Molded Case Circuit Breaker
Brand
Square D
SKU
KA36150MT
Quantity
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Square D KA36150MT - 150A 3 Pole Molded Case Circuit Breaker
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Description
Delivering 150A of thermal-magnetic protection, this 3-pole Square D MCCB is engineered for demanding commercial environments. It utilizes a proven K-Frame design to safeguard electrical infrastructure. The breaker mounts into Square D I-Line panelboards and switchboards, and is officially replaced by the HGA36150 for newer installations. The MT catalog suffix signifies a plug-on shroud on the OFF end. It features an adjustable magnetic trip and a 25kAIC rating at 480VAC.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA36150MT-R |
| Series | KA |
| Amperage | 150A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 25kA @ 480VAC, 22kA @ 600VAC, 10kA @ 250VDC |
| 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 | Terminal Shields (Factory Installed), Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, HACR, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Visual Trip Indicator |
Product FAQs
6 answersWhat type of panelboard is the Square D KA36150MT compatible with?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features a plug-on jaw connection on the line side and wire lugs on the load side.
How does the I-Line mounting system connect the KA36150MT to the busbar?
The I-Line design allows the breaker to plug directly onto the panelboard busbar. The integrated breaker jaws press onto the bus for a secure line connection, eliminating the need for bolt-on hardware and reducing installation time.
What wire sizes and materials are accepted by the load lugs on the KA36150MT?
The load lugs accept either aluminum or copper conductors ranging from 4 AWG to 350 kcmil.
How does the adjustable magnetic trip function work on this breaker?
The KA36150MT features a thermal-magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic element. This allows electricians to tune the instantaneous short-circuit trip threshold to accommodate specific inrush currents, such as those from motor loads, without nuisance tripping.
Is the KA36150MT an obsolete K-Frame breaker, and what is the modern replacement?
Yes, the KA36150MT is a legacy K-Frame molded case circuit breaker. For modern panel upgrades or new installations, Square D has replaced this series with the 150A PowerPact H-Frame, such as the HGA36150, which also utilizes the I-Line mounting standard.
What does the MT suffix indicate on the KA36150MT catalog number?
The MT catalog suffix signifies that the breaker is equipped with a plug-on shroud on the OFF end, which is the load side of the breaker.
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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.