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Federal Pacific NB100 Miniature Circuit Breaker
- 100A
- 2 Pole
- Bolt-On
Federal Pacific
NB100
Miniature Circuit Breaker
Brand
Federal Pacific
SKU
NB100
Quantity
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Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
Re-Certified
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Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB100 |
| Series | NB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NB |
|---|---|
| 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 Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Quantity
Federal Pacific NB100 - 100A 2 Pole Miniature Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB100-R |
| Series | NB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NB |
|---|---|
| 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 Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
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Description
Designed to keep older systems operational, the Federal Pacific NB100 is a 100A, 2-pole miniature circuit breaker. It provides reliable thermal-magnetic protection for commercial facilities. This legacy component installs into Federal Pacific NB and NBLP panelboards, offering an exact fit. It serves as a direct cross-reference for the UBIF2100NB, ensuring seamless integration. Rated for 10kAIC at 120/240VAC, the bolt-on design delivers a secure, vibration-resistant connection to the busbar.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NB100-R |
| Series | NB |
| Amperage | 100A |
| Poles | 2 |
| Mounting Style | Bolt-On |
| Voltage | 120/240VAC |
| Phase | 1 |
| AIC Rating | 10kA @ 120/240VAC |
| Frame Type | NB |
|---|---|
| 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 Thermal, Fixed Magnetic |
| Available Options | Padlock Attachment |
|---|---|
| Accessories | Load Side Lugs Included |
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
Product FAQs
6 answersWhich panelboards accept the FPE NB100 circuit breaker?
This breaker is specifically designed for legacy commercial systems and installs directly into Federal Pacific NB and NBLP panelboards.
Can I use this breaker in an FPE Stab-Lok residential panel?
No. The NB100 is a commercial bolt-on breaker. It will not fit in Stab-Lok enclosures, which require plug-in NA, NC, or NAJ series breakers.
What type of panel connection does the NB100 require?
It features a bolt-on mounting style. Unlike FPE plug-in breakers, this unit bolts directly to the panelboard bus for a secure commercial connection.
What wire gauge and conductor materials are supported by the NB100?
The load-side lugs are rated for both copper and aluminum (Al/Cu) conductors, accepting wire sizes from 1 AWG up to 2/0 AWG.
Are there active aftermarket replacements for the legacy NB100?
Yes, the Connecticut Electric UBIF2100NB is an ETL-listed direct substitute designed to replace the 100A, 2-pole NB100 without requiring panel modifications.
How does the thermal-magnetic trip unit function on this model?
It utilizes fixed trip settings, combining a bimetallic strip for long-time overload protection with a magnetic armature for instantaneous short-circuit protection.
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Parcel shipments with item value over $99 qualify for free economy shipping within the continental US. Please call to confirm special handling instructions. We do not charge a handling fee or require a minimum amount on any order. SuperBreakers does not ship on customer accounts.
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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.