Eaton / Cutler-Hammer NB3800P Molded Case Circuit Breaker
- 800A
- 3 Pole
- Unit Mount
Quantity
Eaton / Cutler-Hammer NB3800P - 800A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Built for heavy industrial environments, the Eaton NB3800P delivers 800A of current-limiting protection. It provides reliable power distribution and advanced safety for commercial facilities. This unit-mount breaker fits seamlessly into Westinghouse Pow-R-Line 4B panelboards and switchboards. It includes standard lug terminals that accept 3/0 AWG to 400 kcmil wire. Featuring a fused thermal-magnetic trip unit, it achieves an impressive 200kAIC at 600VAC to minimize let-through energy.Specifications
| Brand | Eaton / Cutler-Hammer |
|---|---|
| Part Number | NB3800P-R |
| Series | NB |
| Amperage | 800A |
| Poles | 3 |
| Mounting Style | Unit Mount |
| Voltage | 240VAC, 480VAC, 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 200kA @ 240VAC, 200kA @ 480VAC, 200kA @ 600VAC, 100kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse Pow-R-Line 4B Panelboards, Switchboards |
| Wire Gauge | (3) 3/0 AWG-400 kcmil (Cu/Al) |
| Max Wire | 400 kcmil |
| Min Wire | 3/0 AWG |
| 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 | 800NBP20 Current Limiters |
| Standards | CSA C22.2 No. 5, NEMA AB 1, UL 489 |
| Approval | CSA, UL |
| Temp Rating | 40C |
| Construction Features | Current Limiting, Fused, High Interrupting Capacity |
| Special Features | Current Limiting (Integrally Fused) |
Product FAQs
6 answersWhat panelboards are compatible with the NB3800P circuit breaker?
The NB3800P is designed for use in legacy Westinghouse Pow-R-Line 4B panelboards and industrial switchboards.
How does the NB3800P achieve its 200kAIC rating at 600VAC?
This breaker features an integrally fused, current-limiting design. It uses internal limiters to restrict let-through energy during a severe fault, allowing it to safely interrupt up to 200,000 amps at 600VAC.
What size wire is required for the lugs on the NB3800P?
The standard pressure line and load terminals accept three 3/0 AWG to 400 kcmil copper or aluminum conductors per phase.
How much mounting space is required for the NB3800P in a switchboard?
This unit-mount breaker requires a physical footprint of 8.25 inches wide by 22 inches high, with a depth of 5.5 inches.
Is the Eaton NB3800P the same as the Westinghouse NB3800P?
Yes. Eaton acquired the Westinghouse distribution equipment line. The Cutler-Hammer or Eaton NB3800P is the exact same legacy NB-frame breaker and serves as a direct drop-in replacement for original Westinghouse models.
What does the adjustable magnetic trip on the NB3800P allow me to configure?
While the thermal overload protection is fixed at 800 amps, the adjustable magnetic trip allows you to set the instantaneous short-circuit pickup level to coordinate with other protective devices in your electrical system.
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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.