Square D KC342501021 Molded Case Circuit Breaker
- 250A
- 3 Pole
- I-Line
Quantity
Square D KC342501021 - 250A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Designed with integrated remote tripping capabilities, this 250A molded case circuit breaker includes a factory-installed shunt trip mechanism. The unit mounts into Square D I-Line panelboards, providing extra-high interrupting capacity for demanding commercial environments. Delivering 65kAIC at 480VAC, it utilizes reliable thermal-magnetic trip technology to safeguard critical circuits. Facilities upgrading their infrastructure often transition to the PowerPact JJA36250SA.Specifications
| Brand | Square D |
|---|---|
| Series | KC |
| Amperage | 250A |
| Poles | 3 |
| Mounting Style | I-Line |
| Voltage | 240VAC, 480Y/277VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 100kA @ 240VAC, 65kA @ 480Y/277VAC, 65kA @ 480VAC |
| Frame Type | KC_ |
|---|---|
| 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, Alarm Switch, Undervoltage Release |
|---|---|
| Accessories | Load Side Lugs Included, Shunt Trip (Factory Installed) |
| Standards | CSA C22.2 No. 5, IEC 60947-2, NEMA AB 1, UL 489 |
| Approval | CE, CSA, HACR, NOM, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Extra High Interrupting Capacity |
Product FAQs
6 answersWhat does the "1021" suffix indicate in the KC342501021 catalog number?
The 1021 suffix designates that this breaker is equipped with a factory-installed 120/240VAC shunt trip mechanism, which allows the breaker to be tripped remotely by an external voltage signal.
What is the modern replacement for the legacy KC342501021 breaker?
When upgrading infrastructure, engineers typically replace this legacy K-Frame breaker with the modern Square D PowerPact JJA36250SA, which provides the equivalent 250A rating, I-Line mounting, and integrated shunt trip functionality.
Can the KC342501021 be installed in standard Square D load centers?
No, this breaker features an I-Line style plug-in connection and is designed exclusively for commercial and industrial Square D I-Line panelboards and switchboards, not residential QO or Homeline load centers.
Does the KC342501021 require a separate mounting hardware kit for installation?
No, as an I-Line style plug-in breaker, it mounts directly onto the I-Line bus assembly in compatible panelboards and switchboards without the need for separate bolt-on mounting hardware or cable connections on the line side.
How does the adjustable magnetic trip function work on the KC342501021?
While the thermal (long-time) protection is fixed at 250 amps, the magnetic (instantaneous) trip setting is adjustable. This allows electricians to fine-tune the short-circuit response threshold to coordinate with other protective devices in the electrical system.
What is the purpose of the Push-to-Trip button on the KC342501021?
The Push-to-Trip button allows operators to manually trip the breaker to exercise and verify the mechanical operation of the tripping mechanism without exposing themselves to live electrical parts.
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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!!