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Federal Pacific NFJ434150 Molded Case Circuit Breaker
- 150A
- 3 Pole
- Bolt-On
Federal Pacific
NFJ434150
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NFJ434150
Quantity
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Federal Pacific NFJ434150 - 150A 3 Pole Molded Case Circuit Breaker
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Description
Restoring power to older commercial facilities, this 150-amp Federal Pacific MCCB provides essential thermal-magnetic protection. The 3-pole N-Frame breaker is engineered to handle demanding electrical loads safely. It mounts into legacy FPE panelboards, offering a seamless fit that eliminates the need for complex retrofits or adapters. With a robust 18kAIC rating for 480V applications, it features non-interchangeable trip units and accommodates wire sizes from 4 AWG up to 350 kcmil.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NFJ434150-R |
| Series | NFJ |
| Amperage | 150A |
| 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 - 350 kcmil |
| Max Wire | 350 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 |
|---|---|
| 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 NFJ434150 circuit breaker?
This breaker is designed specifically for legacy Federal Pacific Electric (FPE) commercial panelboards and switchboards that accommodate N-Frame or NFJ-Frame bolt-on circuit breakers.
What size conductors can be terminated on the NFJ434150?
The load side lugs on this breaker are sized to accept wire gauges ranging from 4 AWG up to 350 kcmil. Ensure proper torque specifications are followed during installation to maintain a secure connection.
Can the trip settings on the NFJ434150 be adjusted in the field?
No, this breaker features a non-interchangeable thermal-magnetic trip unit. Both the long-time overload and instantaneous short-circuit trip functions are fixed and cannot be adjusted by the user.
Is there a higher interrupting capacity alternative to the NFJ434150?
Yes, the HFJ434150 is the high-interrupting capacity version of this breaker. It shares the same physical dimensions and mounting configuration but offers a higher AIC rating for systems with greater available fault current.
Is the NFJ434150 affected by the FPE Stab-Lok safety concerns?
No. The NFJ434150 is a commercial-grade, bolt-on molded case circuit breaker. It does not use the Stab-Lok plug-on design associated with residential Federal Pacific safety issues and recalls.
How is the NFJ434150 secured inside the panelboard?
It is a bolt-on circuit breaker that fastens directly to the panelboard bus using threaded hardware. This provides a secure, high-contact connection required for three-phase commercial and industrial electrical systems.
Are original Federal Pacific NFJ434150 breakers still being manufactured?
Federal Pacific Electric is no longer in business, making original NFJ-frame breakers obsolete. However, direct replacements are available to fit existing FPE panelboards without requiring a full system retrofit.
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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