Eaton / Westinghouse NB3700 Molded Case Circuit Breaker
- 700A
- 3 Pole
- Bolt-On
Quantity
Eaton / Westinghouse NB3700 - 700A 3 Pole Molded Case Circuit Breaker
Re-Certified
Quantity
Description
Engineered to support aging electrical infrastructure, the Eaton NB3700 provides 700A of thermal-magnetic protection. This legacy molded case circuit breaker features an interchangeable trip unit for commercial facilities. The bolt-on design mounts securely into Westinghouse PRL4 panelboards and switchboards. It serves as a drop-in substitute for HNB3700 and ND3700 units, ensuring a precise fit without custom mounting hardware.Specifications
| Brand | Eaton / Westinghouse |
|---|---|
| Part Number | NB3700-R |
| Series | NB |
| Amperage | 700A |
| Poles | 3 |
| Mounting Style | Bolt-On |
| Voltage | 600VAC, 250VDC |
| Phase | 3 |
| AIC Rating | 42kA @ 240VAC, 30kA @ 480VAC, 22kA @ 600VAC, 20kA @ 250VDC |
| Terminal Type | Lugs |
|---|---|
| For Use With | Westinghouse PRL4 Panelboards, Switchboards |
| Wire Gauge | (3) 3/0 AWG - 400 kcmil |
| 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 | Lugs Not Included |
| Standards | NEMA AB-1, UL 489 |
| Approval | UL |
| Temp Rating | 40C |
| Construction Features | Interchangeable Trip Unit |
Product FAQs
6 answersWhat panelboards are compatible with the NB3700 circuit breaker?
The NB3700 is designed for bolt-on installation in Westinghouse PRL4 panelboards and compatible switchboards.
Can the NB3700 replace other legacy Westinghouse breakers?
Yes, the NB3700 serves as a direct drop-in substitute for HNB3700 and ND3700 units without requiring custom mounting hardware.
What wire sizes are accepted by the lugs on the NB3700?
The standard lugs accept three conductors per phase, ranging from 3/0 AWG to 400 kcmil.
Is the NB3700 rated for DC applications?
Yes, this breaker is rated for up to 250VDC with a 20kA interrupting capacity, in addition to its standard AC voltage ratings.
Does the NB3700 feature adjustable trip settings?
Yes, it features a thermal magnetic trip unit with a fixed thermal element for long-time protection and an adjustable magnetic element for instantaneous short-circuit protection.
Are Eaton and Westinghouse NB3700 breakers the same?
Yes. Eaton acquired the Westinghouse distribution equipment division. Eaton, Cutler-Hammer, and Westinghouse NB3700 breakers share the exact same physical and electrical specifications.
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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.