Federal Pacific NFJ424125 Molded Case Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Federal Pacific
NFJ424125
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ424125
Quantity
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Federal Pacific NFJ424125 - 125A 2 Pole Molded Case Circuit Breaker
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Description
A drop-in replacement for aging systems, the Federal Pacific NFJ424125 restores power in commercial facilities. This two-pole MCCB is rated for 125A and 480VAC, providing reliable overcurrent protection. Designed for legacy infrastructure, this unit mounts into Federal Pacific NFJ panelboards without aftermarket adapters. It serves as an exact match for original FPE hardware. Rated at 18 kAIC at 480V, it utilizes thermal-magnetic trip technology and accepts 4 AWG to 300 kcmil wiring.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ424125 |
| Series | NFJ |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 1 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC |
| Frame Type | NFJ |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific NFJ 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 |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
7 answersWhat panelboards accept the NFJ424125 circuit breaker?
This breaker is designed specifically for installation in legacy Federal Pacific NFJ panelboards.
How does the NFJ424125 connect to the panelboard?
It utilizes a bolt-on connection, requiring it to be securely bolted directly to the panelboard busbar rather than snapping into place.
What wire sizes do the terminals on this breaker accept?
The load-side lugs are designed to accept wire gauges ranging from 4 AWG up to 300 kcmil.
Are the trip settings on the NFJ424125 adjustable?
No, this breaker features a fixed thermal-magnetic trip unit. The long-time and instantaneous trip functions cannot be adjusted in the field.
What is the interrupting capacity of this breaker at 240VAC?
While it has an 18kAIC rating at 480VAC, the interrupting capacity increases to 25kAIC when applied to a 240VAC circuit.
Are there other brands that manufactured the NFJ424125?
Yes, this specific NFJ frame was also manufactured by Challenger and American Circuit Breaker Corp. You may find exact replacements carrying these brand names.
Is there a modern equivalent for the Federal Pacific NFJ424125?
There is no direct modern replacement from current major manufacturers like Eaton or Square D. Replacements must be sourced from legacy inventory or aftermarket manufacturers.
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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!
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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