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Federal Pacific NA250 Miniature Circuit Breaker
- 50A
- 2 Pole
- Plug-On
Federal Pacific
NA250
Miniature Circuit Breaker
Brand
Federal Pacific
SKU
NA250
Quantity
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Federal Pacific NA250 - 50A 2 Pole Miniature Circuit Breaker
New
Quantity
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Federal Pacific NA250 - 50A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NA250 |
| Series | NA |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific Stab-Lok Load Centers |
| 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 |
| Accessories | NA250-R |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Common Trip, Full Size (1 inch per pole) |
Sold out
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Federal Pacific NA250 - 50A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NA250-R |
| Series | NA |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific Stab-Lok Load Centers |
| 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 |
| Accessories | NA250-R |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Common Trip, Full Size (1 inch per pole) |
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Description
Built for heavy-duty residential applications like ranges and HVAC equipment, the Federal Pacific NA250 supplies 50A of two-pole protection. This component mounts into classic Stab-Lok load centers, providing a secure plug-on connection. Serving as a direct substitute for the UBIF250N, it utilizes a full-size two-inch footprint to maintain proper panel spacing. The breaker features an internal common trip mechanism to disconnect both poles simultaneously during a fault, rated at 10kAIC.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NA250 |
| Series | NA |
| Amperage | 50A |
| Poles | 2 |
| Mounting Style | Plug-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific Stab-Lok Load Centers |
| 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 |
| Accessories | NA250-R |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Stab-Lok System, Common Trip, Full Size (1 inch per pole) |
Product FAQs
5 answersWill the NA250 circuit breaker fit any Stab-Lok panel?
It is designed for Federal Pacific Stab-Lok load centers but requires enough physical space for the thick NA frame. Because it measures 1 inch per pole, this 2-pole unit needs 2 inches of total busbar space, which differs from the thinner NC series breakers.
What is the direct aftermarket replacement for the Federal Pacific NA250?
The Connecticut Electric UBIF250N is a commonly used, ETL listed aftermarket replacement circuit breaker specifically designed to cross-reference and replace the legacy NA250 in Stab-Lok panels.
What applications typically require a 50-amp, 240-volt circuit breaker?
A 50-amp, 2-pole circuit breaker is commonly installed to protect dedicated circuits for heavy electrical loads. Typical applications include large electric ranges, central air conditioning units, hot tubs, or acting as a feeder for a smaller subpanel.
How does the Stab-Lok mounting mechanism secure the circuit breaker?
Stab-Lok is a specialized plug-on design that pushes directly onto the busbar of a Federal Pacific panel. It relies on tension clips rather than a bolt-on connection, allowing for rapid installation or removal during panel maintenance.
Are legacy Federal Pacific Stab-Lok electrical panels safe to operate?
Legacy Federal Pacific Stab-Lok panels are frequently flagged by industry professionals due to a known history of breakers failing to trip during overcurrent conditions. While exact requirements vary by local jurisdiction, licensed electricians often recommend full panel upgrades rather than continuing to invest in an aging Stab-Lok system.
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Reviews
Review summary
Customers rate this product 4.9 out of 5 based on 28 reviews.
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Rating
28 reviews
- JMJimmy M.Verified BuyerReviewingFederal Pacific NA230 - 30A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars9/8/26NA230-30
Breaker arrived well packaged and sealed. Installed easily and working great for the customer.
- JEJames E.Verified BuyerReviewingFederal Pacific NA250 - 50A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/23/26Satisfactory
Fast shipping and exactly as expected
- EDErik D.Verified BuyerReviewingFederal Pacific NA250 - 50A 2 Pole Miniature Circuit BreakerI do not recommend this productRated 1 out of 5 stars7/21/26Result of FP
Breakers were wrong size and could not be useful....lost monies.
- JLJeff L.Verified BuyerReviewingFederal Pacific NA20 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/22/26Hard to find breaker
Fit perfectly. Great service
- PPPaul P. J.Verified BuyerReviewingFederal Pacific NA20 - 20A 1 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars12/27/25perfect ...
all is great in the universe the FP 20A Breaker worked perfect.