Square D KC24250AB Molded Case Circuit Breaker
- 250A
- 2 Pole
- I-Line
Quantity
Square D KC24250AB - 250A 2 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Square D KC24250AB - 250A 2 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Square D |
|---|---|
| Part Number | KC24250AB |
| Series | KC |
| Amperage | 250A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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 | Lugs (AL250KA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity, Phase A-B Connection |
Quantity
Square D KC24250AB - 250A 2 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Square D |
|---|---|
| Part Number | KC24250AB-R |
| Series | KC |
| Amperage | 250A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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 | Lugs (AL250KA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity, Phase A-B Connection |
Description
Part of the legacy K-Frame series, this 250-amp molded case circuit breaker provides reliable thermal-magnetic protection for commercial and industrial applications. It installs into Square D I-Line panelboards and switchboards, utilizing a specific Phase A-B bus connection. Featuring an extra high interrupting capacity of 100kA at 240VAC, it ensures robust fault clearing.Specifications
| Brand | Square D |
|---|---|
| Part Number | KC24250AB |
| Series | KC |
| Amperage | 250A |
| Poles | 2 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Square D I-Line Panelboards and Switchboards |
| Wire Gauge | 4 AWG - 350 kcmil |
| 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 | Lugs (AL250KA) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity, Phase A-B Connection |
Product FAQs
6 answersWhat panelboards accept the KC24250AB circuit breaker?
This breaker is designed exclusively for Square D I-Line panelboards and switchboards. It features a plug-on I-Line connection and cannot be installed in standard load centers or unit-mount configurations.
What does the AB suffix indicate on this breaker?
The AB suffix specifies the phase connection. It indicates that this 2-pole breaker is factory-configured to connect to the A and B phases on the I-Line bus stack.
Can the phase connection on the KC24250AB be changed in the field?
No, the phase connection on legacy K-Frame I-Line breakers is factory-set and cannot be modified. If your panel schedule requires a different phase arrangement, you must use a breaker with the corresponding suffix, such as AC or BC.
What is the modern replacement for the legacy KC24250AB?
The KC24250AB is part of the legacy K-Frame series. For modern panel upgrades, it is directly replaced by the PowerPact J-Frame series, specifically the JJA26250AB, which maintains the same 250A rating and A-B phase I-Line connection.
How does the trip unit function on the KC24250AB?
This breaker features a thermal magnetic trip unit with LI (Long-Time and Instantaneous) functions. The thermal protection is fixed at 250 amps, while the magnetic instantaneous trip is adjustable, allowing electricians to fine-tune short-circuit protection for specific loads.
How does the I-Line mounting system work for this breaker?
The KC24250AB snaps directly onto the stacked bus of an I-Line panelboard using built-in plug-on jaws. This design eliminates the need for separate mounting hardware or cabled bus connections, significantly speeding up installation.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 1 review.
- TDTammy D.Verified BuyerReviewingSquare D KC34200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars7/9/26Breakers
great service!! I had bought 3 different breakers & there was one that i had to return. I called as soon as i realized it was wrong.( my fault) I had my return RMA in about 5 minutes of the phone call. Highly recommend!!