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Federal Pacific NFJ437125 Molded Case Circuit Breaker
- 125A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ437125
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ437125
Quantity
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Federal Pacific NFJ437125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Federal Pacific NFJ437125 - 125A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ437125-R |
| Series | NFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| 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, Adjustable 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 |
Quantity
Federal Pacific NFJ437125 - 125A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ437125-R |
| Series | NFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| 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, Adjustable 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 |
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Description
Built for legacy industrial applications, the 125A Federal Pacific NFJ437125 provides essential long-time and instantaneous trip functions. This N-Frame breaker handles up to 480VAC and 250VDC for three-phase commercial setups. Maintenance teams can mount this unit into standard Federal Pacific panelboards. As a true replacement part, it eliminates the need for complex retrofits when servicing older distribution boards.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ437125-R |
| Series | NFJ |
| Amperage | 125A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 25kA @ 240VAC, 18kA @ 480VAC, 10kA @ 250VDC |
| 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, Adjustable 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
7 answersWhich panelboards accept the Federal Pacific NFJ437125?
This N-Frame breaker is specifically designed as a direct replacement for legacy Federal Pacific distribution panelboards. It is not interchangeable with other brands or frame sizes.
What type of wire can be used with the NFJ437125 lugs?
The included lugs accommodate wire sizes from 4 AWG up to 300 kcmil. Ensure your conductors are properly sized for a 125A circuit and torqued to the manufacturer specifications during installation.
How does the adjustable magnetic trip function work on this breaker?
While the thermal (long-time) overload protection is fixed at 125A, the magnetic (instantaneous) trip can be adjusted. This allows electricians to fine-tune the short-circuit response to prevent nuisance tripping during high inrush currents, such as motor startups.
Can the NFJ437125 be used in DC circuits?
Yes, this breaker is rated for 250VDC applications with a 10kA interrupting capacity, making it suitable for specific industrial DC control panels or legacy battery systems, in addition to standard 480VAC three-phase setups.
Is the Federal Pacific NFJ437125 still in production?
No, Federal Pacific Electric (FPE) is no longer manufacturing new equipment. The NFJ437125 is a legacy component utilized by maintenance teams to service and maintain existing FPE infrastructure without requiring a complete panel retrofit.
Are Federal Pacific N-Frame breakers interchangeable with other FPE frames?
No. The NFJ437125 is an N-Frame breaker and will only fit panel spaces designed for this specific physical footprint and bolt-on bus connection. It cannot be used to replace NEF, NJL, or other FPE frame types.
What does the LI trip function code mean for the NFJ437125?
The LI designation stands for Long-Time and Instantaneous trip functions. The long-time function protects against sustained overloads, while the instantaneous function provides immediate tripping during severe short circuits.
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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