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Federal Pacific NEF431050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Federal Pacific
NEF431050
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NEF431050
Quantity
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Federal Pacific NEF431050 - 50A 3 Pole Molded Case Circuit Breaker
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Description
Part of the legacy N-Frame series, this 50A, 3-pole molded case circuit breaker provides reliable thermal-magnetic protection. It is designed to maintain and service existing commercial and industrial electrical infrastructure. The bolt-on unit mounts into Federal Pacific NEF and CDP panelboards, offering a seamless fit without modifications. It effectively replaces older NEF433050 and NEF437050 models. With an interrupting rating of 14 kAIC at 480VAC, it includes vibration-tested construction.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NEF431050-R |
| Series | NEF |
| Amperage | 50A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NEF Panelboards, CDP 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Bell Alarm |
|---|---|
| Accessories | Lugs |
| Standards | CSA C22.2 No. 5.1, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Non-Interchangeable Trip, Reverse Feed, Vibration Tested |
Product FAQs
6 answersAre Federal Pacific NEF431050 breakers compatible with residential Stab-Lok load centers?
No. The NEF431050 is an N-Frame molded case circuit breaker featuring a bolt-on connection. It is strictly designed for commercial and industrial Federal Pacific NEF and CDP panelboards. It will not fit in residential FPE Stab-Lok panels.
What hardware is required to install the NEF431050 into a CDP panelboard?
While the breaker features a standard bolt-on connection, mounting it in a Federal Pacific CDP panelboard typically requires a specific CDP mounting hardware strap kit, such as the NEF1K twin branch hardware. This ensures a secure and code-compliant mechanical connection to the panel's busbars.
What wire sizes do the terminals on the NEF431050 accept?
The integrated mechanical lugs on this breaker are designed to accept wire gauges from 14 AWG up to 2 AWG. Always verify proper manufacturer torque specifications during installation to ensure a secure connection that prevents thermal faults under load.
Can the NEF431050 be used in DC power applications?
Yes. In addition to its AC ratings, this thermal magnetic breaker is rated for 250VDC with a 10kA interrupting capacity (10kAIC). This allows it to safely protect legacy industrial DC applications, such as heavy machinery controls or older DC motor drives, provided the system voltage does not exceed 250 volts.
Can I install this breaker if my 480V panel has an available fault current of 22kA?
No. The NEF431050 has a maximum interrupting rating of 14,000 amps at 480VAC. Installing it in a system where the available fault current exceeds 14kA violates National Electrical Code (NEC) requirements and creates an explosion or arc flash hazard. Proper series rating with upstream current-limiting devices is required if the fault current exceeds the breaker's standalone rating.
Are there aftermarket alternatives to the Federal Pacific NEF431050?
Yes. Because Federal Pacific Electric is an obsolete brand, direct aftermarket drop-in replacements for the NEF frame are often manufactured by companies like American Circuit Breaker Corporation. These equivalents share the same physical dimensions and bolt-on requirements as the original FPE units.
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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.