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Federal Pacific NFJ631125R NFJ631125 - 125A 3 Pole Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ631125R
NFJ631125 - 125A 3 Pole Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ631125R
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Federal Pacific NFJ631125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Rated for 125 amps, the Federal Pacific NFJ631125R is a robust molded case circuit breaker designed for commercial power distribution. This legacy component utilizes fixed thermal-magnetic trip technology. Electricians can mount this unit into older Federal Pacific panelboards to restore functionality. It serves as an exact replacement for the original NFJ631125, eliminating the need for complex retrofits. Tested to handle 25kAIC at 240VAC, it delivers dependable fault interruption.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ631125R |
| Series | NFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 600VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 14kA @ 600VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific Panelboards |
| Wire Gauge | 4 AWG - 300 kcmil |
| Max Wire | 300 kcmil |
| Min Wire | 4 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch |
|---|---|
| Accessories | Lugs |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhich panelboards accept the Federal Pacific NFJ631125 breaker?
This N-Frame breaker is designed specifically as an exact replacement component for legacy Federal Pacific (FPE) panelboards and enclosures that require bolt-on NFJ series breakers.
What wire sizes are supported by the terminals on the NFJ631125?
The included load-side lugs safely accommodate conductor sizes ranging from 4 AWG up to 300 kcmil, making it suitable for standard 125-amp commercial wiring applications.
Is the Federal Pacific NFJ631125 still in active production?
No, original Federal Pacific Electric (FPE) breakers are obsolete. However, exact replacements are stocked to maintain aging infrastructure without requiring complex panel retrofits.
What does the LI trip function code mean on the NFJ631125?
The LI designation indicates that this thermal-magnetic breaker provides both Long-Time thermal protection against sustained overloads and Instantaneous magnetic protection against short circuits.
Can I swap the trip unit on the NFJ631125 for a different amperage?
No, this breaker is built with a non-interchangeable trip unit. The thermal and magnetic trip settings are fixed at 125 amps and cannot be adjusted or swapped.
Can I use this breaker in a 240V or 480V system even though it is rated for 600V?
Yes, the NFJ631125 is rated for a maximum of 600VAC but is fully compatible with 240VAC and 480VAC 3-phase systems. It provides a 25kA interrupting capacity at 240V and 18kA at 480V.
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Reviews
Review summary
Customers rate this product 4.7 out of 5 based on 3 reviews.
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Rating
3 reviews
- ESEvan S.Verified BuyerReviewingFederal Pacific NFJ631225 - 225A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars9/11/26Review
Works great!
- RCRalph C.Verified BuyerReviewingFederal Pacific NFJ631150 - 150A 3 Pole Molded Case Circuit BreakerI recommend this productRated 4 out of 5 stars11/10/25Federal Pacific NF J631150 Breaker
Surprised they had it!
Great shape, well packaged. Fast shipping
- KPKeith P.ReviewingFederal Pacific NFJ631200 - 200A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars12/15/20Quick and easy ordering
Quick and easy ordering