Square D KA362251021 Molded Case Circuit Breaker
- 225A
- 3 Pole
- I-Line
Quantity
Square D KA362251021 - 225A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Engineered for heavy-duty commercial and industrial applications, the Square D KA362251021 is a 3-pole, 225A molded case circuit breaker from the legacy K-Frame series. It mounts into Square D I-Line panelboards and switchboards, providing reliable power distribution. This breaker features thermal-magnetic trip technology with adjustable magnetic settings and includes a factory-installed 120-240VAC shunt trip. It delivers a 25kAIC interrupting rating at 480VAC and is fully HACR rated.Specifications
| Brand | Square D |
|---|---|
| Series | KA |
| Amperage | 225A |
| 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 |
|---|---|
| Accessories | Shunt Trip (Factory Installed), Load Side Lugs Included |
| 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
9 answersWhat does the 1021 suffix mean on the KA362251021 circuit breaker?
The 1021 suffix indicates that this breaker includes a factory-installed 120/240VAC shunt trip. This allows the breaker to be tripped remotely by applying a voltage signal to the shunt trip coil.
What is the primary application for the included shunt trip?
The factory-installed 120/240VAC shunt trip is commonly used to tie the breaker into emergency stop systems, fire alarms, or remote monitoring panels. This allows the circuit to be disconnected automatically during a safety event.
Which panelboards are compatible with the KA362251021 breaker?
This breaker is designed exclusively for use in Square D I-Line panelboards and switchboards. It features an I-Line style plug-in connection that mounts directly onto the bus assembly.
Is the Square D KA-frame series still in active production?
The KA-frame is a legacy series that has been discontinued by the manufacturer. For complete panel upgrades, Square D has replaced the K-frame with the newer PowerPact J-frame series. However, the KA362251021 serves as a direct drop-in replacement for existing I-Line setups.
How does the KA362251021 mount into the panel?
It utilizes an I-Line plug-on connection. The breaker snaps directly onto the I-Line bus stack, eliminating the need for bolt-on bus connections and reducing installation time.
Is the trip unit on the KA362251021 adjustable?
This breaker features a thermal-magnetic trip unit with a fixed thermal element for overload protection and an adjustable magnetic element for short-circuit protection, allowing you to fine-tune the instantaneous trip threshold.
Are the lugs on the KA362251021 rated for both aluminum and copper conductors?
Yes, the factory-installed lugs are dual-rated for both aluminum and copper wire, accepting conductor sizes from 4 AWG up to 350 kcmil.
Does this breaker have a visual trip indicator?
Yes, Square D KA-frame breakers feature a Visi-Trip indicator. When the breaker trips, the handle snaps to a center position and a highly visible red indicator appears, making it easy to identify the faulted circuit.
Can the KA362251021 be used in DC applications?
Yes, in addition to its standard AC ratings, this breaker is rated for 250VDC applications, providing a 10kA interrupting capacity for direct current systems.
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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.