Federal Pacific NB232050 Molded Case Circuit Breaker
- 50A
- 3 Pole
- Bolt-On
Quantity
Federal Pacific NB232050 - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
Quantity
Federal Pacific NB232050 - 50A 3 Pole Molded Case Circuit Breaker
New
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB232050 |
| Series | NB |
| Amperage | 50A |
| 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 | 14-1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| 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 NB232050 - 50A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
| Brand | Federal Pacific |
|---|---|
| Part Number | NB232050-R |
| Series | NB |
| Amperage | 50A |
| 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 | 14-1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| Accessories | Load Side Lugs Included |
|---|---|
| Standards | CSA C22.2 No. 5, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Common Trip |
Description
Manufactured to support legacy commercial applications, this 50A molded case circuit breaker offers dependable thermal-magnetic trip functions. It integrates into classic Federal Pacific NB and NBLP panelboards to keep existing distribution systems operational. Delivering a 10kAIC interrupt rating at 240VAC, this three-pole bolt-on device acts as a reliable cross-reference for the NB3P50. It accommodates 14-1/0 AWG wire for versatile industrial installations.Specifications
| Brand | Federal Pacific |
|---|---|
| Part Number | NB232050 |
| Series | NB |
| Amperage | 50A |
| 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 | 14-1/0 AWG (Al/Cu) |
| Max Wire | 1/0 AWG |
| Min Wire | 14 AWG |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Fixed Magnetic |
| 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 accept the Federal Pacific NB232050 circuit breaker?
This breaker is engineered specifically for legacy Federal Pacific NB and NBLP commercial panelboards. It is not compatible with standard residential load centers.
How is the NB232050 installed into the panel?
It uses a bolt-on mounting configuration. The breaker bolts directly to the panelboard bus, providing a secure connection that prevents arcing in commercial environments with constant power demand.
What wire sizes and materials are supported by the terminals on this breaker?
The load side lugs accommodate both aluminum and copper conductors, accepting wire gauges from 14 AWG up to 1/0 AWG.
Are there aftermarket alternatives for the Federal Pacific NB232050?
Yes. Because original Federal Pacific Electric equipment is obsolete, aftermarket manufacturers such as Connecticut Electric produce ETL-listed bolt-on replacements designed to fit NBLP and NB panelboards.
Does the NB series share the same design as Federal Pacific Stab-Lok breakers?
No. The NB series features a commercial bolt-on design, which is distinct from the residential plug-on Stab-Lok breakers. Bolt-on breakers provide a more secure mechanical connection to the busbar.
How does the thermal magnetic trip unit operate on the NB232050?
The fixed thermal magnetic trip unit provides Long-Time protection for sustained overloads and Instantaneous protection for immediate short-circuit clearing.
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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.
- 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.