Eaton / Westinghouse NB3500PR NB3500P - 500A 3 Pole Molded Case Circuit Breaker
- 500A
- 3 Pole
- Bolt-On
Quantity
Eaton / Westinghouse NB3500P - 500A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered for demanding industrial environments, the Eaton NB3500PR is a 3-pole, 500A current-limiting molded case circuit breaker. It provides reliable thermal-magnetic protection for commercial facilities and motor control centers. This bolt-on unit serves as an exact replacement for aging infrastructure, fitting seamlessly into Westinghouse PRL4 panelboards. For modern upgrades, this legacy NB frame is replaced by the Eaton Series C ND frame. It features a 200kAIC rating at 480V.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | NB3500PR-R |
| Series | NB |
| Amperage | 500A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 200kA @ 600VAC, 100kA @ 250VDC |
| Frame Type | NB |
|---|---|
| Terminal Type | Lugs |
| For Use With | Westinghouse PRL4 Panelboards, Switchboards, Motor Control Centers |
| Trip Technology | Thermal Magnetic |
|---|---|
| Trip Function Code | LI |
| Trip Function | Long-Time, Instantaneous |
| Trip Adjustability | Fixed Thermal, Adjustable Magnetic |
| Available Options | Shunt Trip, Auxiliary Switch, Undervoltage Release, Alarm Switch |
|---|---|
| Accessories | Current Limiters |
| Standards | NEMA AB-1, UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Fused, Interchangeable Trip Unit |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
5 answersWhat panelboards are compatible with the NB3500PR-R circuit breaker?
This NB-frame breaker is designed for use in legacy Westinghouse PRL4 panelboards, as well as compatible switchboards and motor control centers.
How does the current limiting feature of the NB3500PR-R benefit a power system?
As a current limiting breaker, it restricts the peak let-through current during a fault. This provides enhanced protection for downstream components and allows the breaker to safely achieve a high interrupting rating of 200kA at 480VAC.
Can the trip settings on the NB3500PR-R be adjusted in the field?
Yes, this breaker features an interchangeable thermal-magnetic trip unit with a fixed thermal element for long-time protection and an adjustable magnetic element for instantaneous short-circuit protection.
Why might this breaker be labeled as Eaton, Cutler-Hammer, or Westinghouse?
Eaton acquired the Westinghouse electrical distribution equipment division in the 1990s. The NB3500PR-R and other NB-frame breakers may carry Eaton, Cutler-Hammer, or Westinghouse branding depending on the exact year of manufacture, but they are physically and electrically identical.
What does the feed-thru connection type indicate for this breaker?
A feed-thru connection indicates that the breaker utilizes lugs on both the line and load sides for direct cable connections, allowing it to be wired in-line with the power circuit rather than drawing power directly through a busbar connection.
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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.