Federal Pacific NEF431050R Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Federal Pacific
NEF431050R
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NEF431050R
Quantity
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Federal Pacific NEF431050R - 50A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy N-Frame series, this 50A molded case circuit breaker provides reliable thermal-magnetic protection for commercial and industrial applications. It is designed to maintain existing infrastructure without requiring complete system upgrades. This unit mounts into compatible Federal Pacific panelboards, serving as an exact drop-in replacement. It eliminates the need for aftermarket adapters or retrofits when swapping out older hardware.Specifications
| Brand | Federal Pacific |
|---|---|
| Series | NEF |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| Frame Type | NEF |
|---|---|
| Terminal Type | Lugs |
| For Use With | Federal Pacific Panelboards |
| Wire Gauge | 14-2 AWG |
| Max Wire | 2 AWG |
| Min Wire | 14 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, Bell Alarm |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | HACR Rated, Non-Interchangeable Trip, Reverse Feed, Vibration Tested |
Product FAQs
6 answersWhich panelboards are compatible with the NEF431050R circuit breaker?
This 3-pole breaker is designed specifically for legacy Federal Pacific (FPE) panelboards configured for N-frame molded case circuit breakers. It utilizes a bolt-on connection and will not fit in standard plug-on load centers or Stab-Lok panels.
What wire gauge range do the terminals on the NEF431050R accept?
The factory lugs accommodate wire sizes from 14 AWG up to 2 AWG. Electricians must verify the conductor material and apply the correct torque specifications during installation to prevent thermal issues at the connection point.
Is the NEF431050R suitable for direct current applications?
Yes, in addition to its standard AC ratings, this thermal-magnetic breaker is rated for 250VDC systems, providing a 10kA interrupting capacity for DC fault protection.
Are Federal Pacific NEF frame breakers still manufactured?
Original FPE components are obsolete. To maintain existing infrastructure, legacy panelboards require exact-fit N-frame replacements, which are often fulfilled through verified legacy stock or certified aftermarket substitutes.
Can the trip curve on the NEF431050R be adjusted in the field?
No, this thermal-magnetic breaker features fixed long-time and instantaneous (LI) trip functions. The trip elements are factory calibrated to 50 amps and cannot be modified by the installer.
How does the NEF431050R mount into the panelboard?
This is a bolt-on molded case circuit breaker. Depending on the specific Federal Pacific panelboard model, installation may require a dedicated NEF mounting kit or hardware bracket to secure the breaker to the busbar.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 6 reviews.
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Rating
6 reviews
- SCStephen C.Verified BuyerReviewingFederal Pacific NEF431030 - 30A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/21/26Fpe 3 pole 30 amp breaker.
I ordered the breaker on Thursday and it was at my house for Saturday morning. Breaker is in pristine condition. A real bail out. Thank you.
- MRMichael R.Verified BuyerReviewingFederal Pacific NEF431040 - 40A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars8/4/25Warehouse Air Compressor
Worked like a charm.
Thank you.
- DPDiana P.ReviewingFederal Pacific NEF433020 3 Pole Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/21Satisfied
Service was GREAT!!
- DJDavid J.ReviewingFederal Pacific / American NEF431100 - 100A 3 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars1/13/21This worked out great.
This worked out great.
- MWMark W.ReviewingFederal Pacific NEF421050 - 50A 2 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars11/17/19Great service & pricing
Superbreakers did a great job for us. We called and asked if the breakers were actually in their possession. Withing 30 minutes they called us back (which is rare these days), and we got our breakers the next morning.