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Square D KA36150-1021 Molded Case Circuit Breaker
- 150A
- 3 Pole
- I-Line
Square D
KA36150-1021
Molded Case Circuit Breaker
Brand
Square D
SKU
KA36150-1021
Quantity
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Square D KA36150-1021 - 150A 3 Pole Molded Case Circuit Breaker
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Description
Built for advanced control, the Square D KA36150-1021 is a 3-pole, 150A molded case circuit breaker. It integrates a factory-installed 120-240VAC shunt trip, allowing facility managers to remotely open the circuit for automated control. Designed with an I-Line connection, it mounts into compatible Square D I-Line panelboards. It is replaced by the HGA36150 with a shunt trip accessory. Rated for 42kAIC at 240VAC, it utilizes thermal-magnetic trip technology with adjustable magnetic settings.Specifications
| Brand | Square D |
|---|---|
| Part Number | KA36150-1021 |
| 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 |
| 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 | Auxiliary Switch, Undervoltage Release, Alarm Switch, Padlock Attachment |
|---|---|
| Accessories | Shunt Trip (120-240VAC), Load Side Lugs |
| 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, Non-Interchangeable Trip |
Product FAQs
7 answersWhat does the -1021 suffix mean on the KA36150-1021?
The -1021 suffix indicates that this breaker includes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely via an external control signal, which is commonly used for emergency shutdowns or automated control systems.
Is the Square D KA36150-1021 still manufactured, or is there a modern replacement?
The KA-frame is a legacy series. For new installations or complete panel upgrades, it is typically replaced by the modern Square D PowerPact H-Frame series (such as the HGA36150 or HDA36150). Note that to match the -1021 functionality, the replacement PowerPact breaker will require a field-installable shunt trip accessory.
What type of panels will the KA36150-1021 fit into?
This breaker features an I-Line style plug-in connection and is designed exclusively for use in compatible Square D I-Line panelboards and switchboards. It will not fit in standard QO, NQ, or NF series panels.
How does the I-Line mounting system work for the KA36150-1021?
The I-Line plug-on design allows the breaker to snap directly onto the panelboard bus assembly using specialized jaws. This eliminates the need for bolted bus connections on the line side, significantly reducing installation time and allowing for easier phase balancing.
How does the adjustable magnetic trip on the KA36150-1021 benefit my installation?
While the thermal overload protection is fixed, the adjustable magnetic trip allows you to fine-tune the instantaneous short-circuit response. This is particularly useful for coordinating with other protective devices or preventing nuisance tripping from high motor inrush currents.
Is the KA36150-1021 suitable for HVAC applications?
Yes, this breaker is HACR rated, meaning it is certified for use with heating, air conditioning, and refrigeration equipment that requires group motor protection.
How do I identify if the KA36150-1021 has tripped in the panel?
When a fault occurs, the breaker handle snaps to a center tripped position, halfway between ON and OFF. To restore power after clearing the fault, you must first push the handle completely to the OFF position to reset the mechanism before turning it back ON.
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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.