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Manufacturer Resources
Spec Sheet
Product Specs
- Amperage Rating:
- 700A
- Circuit Breaker Frame Type:
- Trip unit
- Circuit Breaker Type:
- NB
- Interrupt Rating:
- 200 kAIC at 600 Vac, 100 kAIC at 250 Vdc
- Line:
- Pressure
- Magnetic Trip Range:
- 3000-6000A
- Number Of Poles:
- Three-pole
- Trip Type:
- Fixed thermal, fixed magnetic
- Voltage Rating:
- 600 Vac, 250 Vdc
- Department:
- Electrical
- Product Type:
- Trip unit only
- Product Length:
- 5.5 IN
- Product Details:
- Trip unit only
- Product Height:
- 8.25 IN
- Product Weight:
- 4 LB
- Product Width:
- 8.25 IN
B-LINE NB3700PT – Frequently Asked Questions
1) Does the NB3700PT come as a complete circuit breaker or just the trip unit?
The NB3700PT is a trip unit only. You get the interchangeable trip element, not a breaker with a frame, housing, or line and load terminals. If you are replacing a whole breaker, this is not the part; if you are re-rating or repairing an existing Eaton NB-type molded case breaker frame, this is what goes in it.
2) What amperage and pole configuration is the NB3700PT trip unit?
700 amps, three-pole. That rating is fixed, so the trip unit sets the breaker's continuous current rating at 700A once installed in the NB frame. A three-pole trip unit will not serve a two-pole application.
3) Is the trip setting on the NB3700PT adjustable?
No. It is a fixed thermal, fixed magnetic trip unit, so neither the overload nor the instantaneous pickup can be dialed in the field. The magnetic trip range is 3000-6000A, which is the band the instantaneous element operates within. If your coordination study calls for an adjustable instantaneous setting, you need an adjustable-trip unit instead.
4) What interrupting rating does the NB3700PT give me, and will it hold on a 600V system with high available fault current?
200 kAIC at 600 Vac and 100 kAIC at 250 Vdc. Voltage rating is 600 Vac / 250 Vdc, so it covers 480Y/277V and 600V three-phase distribution as well as 250V DC. With 200 kA of AC interrupting capacity it will cover service entrance and switchboard locations where available fault current is high. Do not apply it above 600 Vac.
5) Will the NB3700PT fit an Eaton breaker frame other than the NB type?
It is built for the Eaton Classic NB frame type, and that is the only family it is specified for. Trip units are not interchangeable across molded case frame families, so an F, K, L, or M frame breaker needs its own trip element. Match the frame designation stamped on your existing breaker before ordering.
6) Can I use the NB3700PT to re-rate an existing 700A NB breaker to a different amperage?
No. This trip unit is rated 700A with fixed thermal and fixed magnetic elements, so it can only produce a 700A breaker. To change the rating of an NB frame you order the trip unit matching the amperage you want, not this one.
7) What is the exact manufacturer part number for this Eaton Classic 700A NB trip unit?
The part number is NB3700PT, a three-pole 700A trip unit in the Eaton Classic NB family. Use that number when cross-referencing against a spec or an existing breaker nameplate.
8) Is the NB3700PT a pressure-line connection trip unit?
Yes, it belongs to the Pressure line within the Eaton Classic NB range. That designation matters when you are matching a replacement trip element to an existing installed breaker, since the line determines the terminal and mounting arrangement of the frame it goes into.
How fast can I get the B-LINE NB3700PT delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the B-LINE NB3700PT come with a warranty?
Absolutely. The B-LINE NB3700PT is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the B-LINE NB3700PT?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
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