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Federal Pacific NFJ434125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ434125
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ434125
Quantity
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Federal Pacific NFJ434125 - 125A 3 Pole Molded Case Circuit Breaker
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Description
Engineered for commercial applications, the NFJ434125 is a 3-pole, 125A MCCB from Federal Pacific's legacy N-Frame series. It delivers essential long-time and instantaneous trip functions. This bolt-on unit installs into original Federal Pacific panelboards, serving as an exact drop-in replacement to keep aging infrastructure operational.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ434125 |
| Series | NFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC |
| Frame Type | NFJ |
|---|---|
| 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, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Lugs |
| Standards | UL 489, NEMA AB-1 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip |
Product FAQs
6 answersWhat type of enclosures or panels accept the NFJ434125 breaker?
The NFJ434125 is specifically engineered to bolt into legacy Federal Pacific Electric (FPE) commercial panelboards designed for N-Frame molded case circuit breakers. It will not fit in standard residential load centers or panels from other manufacturers.
Is the Federal Pacific NFJ434125 still in active production?
No, Federal Pacific Electric is no longer in business, making original NFJ series breakers obsolete. However, exact drop-in replacements are sourced to keep aging FPE infrastructure operational without requiring a complete panelboard retrofit.
Are there modern cross-reference breakers that fit in place of the NFJ434125?
Because legacy Federal Pacific commercial panelboards utilize proprietary bus bar spacing and bolt-on mounting configurations, modern breakers from brands like Square D, Eaton, or Siemens will not fit. You must use an original FPE N-Frame breaker or a recognized aftermarket exact replacement.
What are the wiring requirements for the load side of the NFJ434125?
The breaker is equipped with load-side lugs that accommodate conductors from 4 AWG to 300 kcmil. Electricians must ensure the wire is properly sized for the 125A load and that the lugs are torqued to the specifications listed on the breaker faceplate to avoid thermal issues.
Is the NFJ434125 suitable for 600V commercial applications?
No, this specific model is rated for a maximum of 480VAC. Facilities operating on 600VAC systems must use a different Federal Pacific N-Frame breaker, such as those in the NFJ6 series, to ensure safe and compliant overcurrent protection.
How does the thermal-magnetic trip mechanism protect legacy FPE systems?
The NFJ434125 utilizes a non-interchangeable LI (Long-Time and Instantaneous) trip unit. The thermal bimetal safely disconnects the circuit during sustained overloads, while the magnetic electromagnet provides immediate tripping during severe short circuits, preventing catastrophic damage to older wiring and equipment.
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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