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Federal Pacific NEF421050 Molded Case Circuit Breaker
- 50A
- 2 Pole
- Bolt-On
Federal Pacific
NEF421050
Molded Case Circuit Breaker
Brand
Federal Pacific
SKU
NEF421050
Quantity
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Federal Pacific NEF421050 - 50A 2 Pole Molded Case Circuit Breaker
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Description
Built for commercial applications, the NEF421050 is a 50A, 2-pole molded case circuit breaker that keeps legacy electrical systems running safely. It delivers reliable overcurrent and short-circuit protection for aging infrastructure. This breaker mounts securely into Federal Pacific panelboards, ensuring an exact fit without adapters. It crosses to the UBIF0250N substitute. Delivering a 14kAIC rating at 480VAC, it includes non-interchangeable trip units and is suitable for reverse feed.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NEF421050-R |
| Series | NEF |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC, 480VAC, 250VDC |
| Phase | 1 |
| AIC Rating | 18kA @ 240VAC, 14kA @ 480VAC, 10kA @ 250VDC |
| 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 Thermal, Fixed Magnetic |
| Available Options | Shunt Trip, Undervoltage Release, Auxiliary Switch, 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 answersWhat panelboards accept the NEF421050 circuit breaker?
This breaker is designed as an exact fit component for legacy Federal Pacific NEF panelboards. It mounts directly into the panel without requiring mounting adapters.
Is there a modern substitute available for the Federal Pacific NEF421050?
Yes, the UBIF0250N is a verified aftermarket substitute that can be used to replace this legacy N-frame model in existing Federal Pacific enclosures.
Can the NEF421050 be used in reverse feed applications?
Yes, this molded case circuit breaker is suitable for reverse feed setups, allowing it to be back-fed in compatible commercial and industrial distribution systems.
What protection does the LI trip function provide on this breaker?
The LI designation indicates Long-Time and Instantaneous trip functions. The long-time element provides delayed tripping for sustained overloads, while the instantaneous element trips immediately to clear short circuits.
Is the NEF421050 part of the Federal Pacific Stab-Lok line?
No. The NEF421050 is a commercial-grade N-frame molded case circuit breaker. It utilizes a completely different design and mounting style than the residential Stab-Lok series.
Does this breaker feature an interchangeable trip unit?
No, the NEF421050 is constructed with a fixed, non-interchangeable thermal-magnetic trip unit.
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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.