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Federal Pacific NFJ631125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ631125
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ631125
Quantity
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Federal Pacific NFJ631125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Rated for 125A, this 3-phase molded case circuit breaker delivers essential thermal-magnetic protection for commercial and industrial applications. It features non-interchangeable trip units with long-time and instantaneous functions to prevent equipment damage. This legacy N-Frame breaker installs into older Federal Pacific panelboards. The bolt-on mounting style ensures a secure, vibration-resistant connection, making it an ideal solution for facility managers maintaining existing hardware.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ631125-R |
| 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 answersWhat panelboards are compatible with the Federal Pacific NFJ631125?
This N-Frame breaker is designed specifically for legacy Federal Pacific (FPE) distribution panelboards that accept bolt-on NFJ series circuit breakers.
What wire gauge range do the lugs on the NFJ631125 accept?
The standard lugs accommodate conductor sizes from 4 AWG up to 300 kcmil. Ensure your wire size matches the 125-amp circuit requirements during installation.
Can I replace the NFJ631125 with a modern circuit breaker?
There is no direct modern cross-reference for this legacy N-Frame breaker. Maintaining existing Federal Pacific infrastructure requires an exact NFJ-series replacement to fit the original panelboard bus.
Does the NFJ631125 require a specific mounting hardware kit?
Yes, installing this breaker into a Federal Pacific CDP panelboard typically requires an NFJ-specific mounting hardware kit, such as the NFJ1K, to properly secure the bolt-on connections.
Can the trip settings on the NFJ631125 be adjusted in the field?
No, this breaker features a fixed thermal and fixed magnetic trip unit. The long-time and instantaneous protection settings are factory-calibrated and cannot be modified.
What is the maximum interrupting capacity of the NFJ631125?
The maximum interrupting capacity is 25kA at 240V AC. It is also rated for 18kA at 480V AC and 14kA at 600V AC, allowing it to safely clear faults across various commercial voltage systems.
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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