Square D KC342251021 Molded Case Circuit Breaker
- 225A
- 3 Pole
- I-Line
Quantity
Square D KC342251021 - 225A 3 Pole Molded Case Circuit Breaker
New
Quantity
Description
Part of the legacy K-frame family, this 225A molded case circuit breaker provides reliable thermal-magnetic protection for commercial and industrial power systems. It installs into standard Square D I-Line panelboards and switchboards, utilizing a plug-on design for rapid deployment. Featuring a factory-installed 120-240VAC shunt trip for remote tripping capabilities, it delivers an extra-high interrupting capacity of 100kA at 240V. This unit is commonly replaced by the modern JJA36225.Specifications
| Brand | Square D |
|---|---|
| Series | KC |
| Amperage | 225A |
| 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 |
| 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, Motor Operator |
|---|---|
| Accessories | Lugs (AL250KA), Shunt Trip (120-240VAC) |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Current Limiting, Extra High Interrupting Capacity |
Product FAQs
6 answersWhat does the 1021 suffix indicate on the KC342251021 circuit breaker?
The 1021 suffix designates that this breaker includes a factory-installed 120/240VAC shunt trip, allowing for remote tripping capabilities.
What is the modern replacement for the legacy Square D KC342251021?
This legacy K-Frame breaker is commonly replaced by the modern PowerPact J-Frame equivalent, catalog number JJA36225. To replicate the remote tripping function of the 1021 suffix, a compatible 120/240VAC shunt trip accessory must be added to the replacement breaker.
Can the KC342251021 be used in standard NEMA enclosures or load centers?
No. This breaker features an I-Line style plug-in connection and is designed exclusively for use in Square D I-Line panelboards and switchboards. It cannot be unit-mounted or installed in standard QO or Homeline load centers.
What does the LI trip function code indicate on this breaker?
The LI code signifies that the thermal-magnetic trip unit provides Long-Time (L) overload protection and Instantaneous (I) short-circuit protection. The thermal element is fixed, while the magnetic instantaneous trip point is adjustable to suit specific application requirements.
How is the factory-installed shunt trip typically utilized in safety systems?
The integrated 120/240VAC shunt trip allows the breaker to be opened remotely via an external control signal. This is frequently used to tie the breaker into emergency shutoff circuits, elevator controls, or fire suppression interlocks.
What type of conductors can be used with the KC342251021 lugs?
The included lugs are rated for both aluminum and copper (Al/Cu) conductors ranging from 4 AWG to 350 kcmil. Ensure proper torque specifications are followed during installation to maintain a secure connection.
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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!!