Federal Pacific NB231100 Miniature Circuit Breaker
- 100A
- 3 Pole
- Bolt-On
Federal Pacific
NB231100
Miniature Circuit Breaker
Brand
Federal Pacific
SKU
NB231100
Quantity
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Federal Pacific NB231100 - 100A 3 Pole Miniature Circuit Breaker
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Federal Pacific NB231100 - 100A 3 Pole Miniature Circuit Breaker
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| Brand | Federal Pacific |
|---|---|
| Part Number | NB231100 |
| Series | NB |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
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Federal Pacific NB231100 - 100A 3 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB231100-R |
| Series | NB |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
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Description
Engineered for commercial applications, the Federal Pacific NB231100 is a 3-pole, 100A miniature circuit breaker. It provides essential long-time and instantaneous trip functions for older electrical systems. This legacy unit mounts into Federal Pacific NB and NBLP panelboards. It serves as an exact, no-adapter-needed replacement for the UBIF3100NB, ensuring a proper fit. Featuring a 10kAIC rating at 240VAC, this bolt-on breaker utilizes proven thermal magnetic trip technology.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NB231100-R |
| Series | NB |
| Amperage | 100A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 240VAC |
| Phase | 3 |
| AIC Rating | 10kA @ 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 | UL 489, CSA C22.2 No. 5 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
Product FAQs
6 answersWhich panelboards accept the Federal Pacific NB231100 circuit breaker?
This 3-pole breaker is specifically designed to fit legacy Federal Pacific NB and NBLP series commercial panelboards. It is not compatible with standard residential Stab-Lok load centers.
How is the NB231100 secured to the panel busbar?
It utilizes a bolt-on mounting configuration. This provides a secure, vibration-resistant connection to the busbar, which is required for commercial NB and NBLP panelboards.
What is the aftermarket cross-reference for the obsolete NB231100 breaker?
The Connecticut Electric UBIF3100NB is a direct aftermarket substitute that can be used to replace this 100-amp Federal Pacific breaker without requiring panel modifications.
What are the wire size requirements for the load side terminals on the NB231100?
The integrated load side lugs are rated to accept either copper or aluminum conductors ranging from 1 AWG up to 2/0 AWG. Ensure proper torque specifications are followed during installation to prevent terminal overheating.
What type of trip protection does the NB231100 provide?
It features fixed thermal-magnetic trip technology. The Long-Time (L) function handles sustained overloads, while the Instantaneous (I) function responds immediately to severe short circuits.
Can the NB231100 be used on 480V systems?
No. This breaker has a maximum voltage rating of 240V AC and provides a standard interrupting capacity of 10kA at 240V. It is not rated for 480V or 277V applications.
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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.