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Federal Pacific NB125 Miniature Circuit Breaker
- 125A
- 2 Pole
- Bolt-On
Federal Pacific
NB125
Miniature Circuit Breaker
Brand
Federal Pacific
SKU
NB125
Quantity
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Federal Pacific NB125 - 125A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
Sold out
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Federal Pacific NB125 - 125A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB125 |
| Series | NB |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NB Panelboards, NBLP Panelboards |
| Wire Gauge | 1-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
Quantity
Federal Pacific NB125 - 125A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB125-R |
| Series | NB |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NB Panelboards, NBLP Panelboards |
| Wire Gauge | 1-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
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Description
Mounts into legacy NB and NBLP panelboards to provide high-capacity overcurrent defense. This 125-amp, two-pole Federal Pacific breaker is engineered for commercial and industrial environments requiring a reliable 120/240VAC power distribution solution. The bolt-on design ensures a stable connection to the busbar, preventing the arcing issues sometimes associated with older plug-on types. Featuring a 10kAIC rating, it serves as an exact cross-reference for the UBIF2125NB replacement.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NB125-R |
| Series | NB |
| Amperage | 125A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Federal Pacific NB Panelboards, NBLP Panelboards |
| Wire Gauge | 1-2/0 AWG (Al/Cu) |
| Max Wire | 2/0 AWG |
| Min Wire | 1 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
Product FAQs
6 answersWhich panelboards are compatible with the Federal Pacific NB125?
The NB125 is a bolt-on miniature circuit breaker designed specifically for legacy Federal Pacific NB and NBLP commercial panelboards.
Is there a modern aftermarket replacement for the FPE NB125?
Yes, Connecticut Electric manufactures an ETL-listed direct aftermarket replacement for this model, available under catalog number UBIF2125NB.
What type of wire is compatible with the NB125 terminals?
The factory lug terminals on the NB125 accept both copper and aluminum (Al/Cu) conductors ranging from 1 AWG to 2/0 AWG.
How does the NB series breaker connect to the panelboard?
The NB125 features a bolt-on mounting style. It must be mechanically fastened to the panelboard busbar using hardware, which provides a secure, vibration-resistant connection compared to standard plug-on breakers.
Are Federal Pacific circuit breakers still considered safe for use?
Many legacy Federal Pacific Electric (FPE) systems have documented failure rates during overcurrent events. Although the NB series is a commercial bolt-on design rather than the heavily scrutinized residential plug-on line, industry experts and insurance providers generally recommend having existing FPE panelboards evaluated by a licensed professional for potential upgrade.
What trip functions are included on the NB125 breaker?
This breaker utilizes a fixed thermal-magnetic trip unit that provides long-time and instantaneous (LI) protection. The thermal element responds to prolonged overloads, while the magnetic element trips immediately during a short circuit.
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Reviews
Review summary
Customers rate this product 5.0 out of 5 based on 18 reviews.
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Rating
18 reviews
- MMMike M.Verified BuyerReviewingFederal Pacific NB100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars7/2/26100amp federal pacific breaker
So far the breaker works as expected
Just good to know some of these old federal are still available.
Thank you
- SGscott g.Verified BuyerReviewingFederal Pacific NB111020 - 20A 1 Pole Molded Case Circuit BreakerI recommend this productRated 5 out of 5 stars6/26/26Hard to find breakers
Had a project at a school built in the 1960’s and thought we were up a creek when confronted with ancient FPE commercial panels. Luckily we found what we needed with Suoerbreakers.
- BFBarry F.Verified BuyerReviewingFederal Pacific NB100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars6/13/26Hard to find circuit breaker
Item was as described.
- WWWilliam W.Verified BuyerReviewingFederal Pacific NB100 - 100A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/9/26Exactly what I needed.
Awesome! Packaging and delivery were good. Bolted in and worked perfectly!!)
- GHGary H.Verified BuyerReviewingFederal Pacific NB125 - 125A 2 Pole Miniature Circuit BreakerI recommend this productRated 5 out of 5 stars3/3/26Federal Pacific NB125 2 Pole Circuit Breaker
Federal Pacific NB125 2 Pole Circuit Breaker
Great product and excellent price and warranty.