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Manufacturer Resources
Spec Sheet
Product Specs
- Amperage Rating:
- 400A
- Frame Size:
- K-frame
- Number Of Poles:
- Three-pole
- Series:
- Series C
- Trip Type:
- Thermal magnetic
- Department:
- Electrical
- Product Length:
- 6.9 IN
- Product Height:
- 5.4 IN
- Product Weight:
- 1.95 LB
- Product Width:
- 4.2 IN
B-LINE KT3400T – Frequently Asked Questions
1) What frame size and amp rating is the B-Line KT3400T trip unit?
The KT3400T is a K-frame trip unit rated 400A, three-pole, from the Eaton Series C molded case circuit breaker line. Frame size is the first thing to match: a K-frame trip unit will not mount on a J-frame or L-frame breaker, so confirm the breaker body is K-frame before ordering.
2) Will a KT3400T work on a two-pole K-frame breaker?
No. The KT3400T is built as a three-pole unit, so it suits three-pole K-frame breakers. For a two-pole breaker you need the matching two-pole trip unit in the same K-frame Series C family at the amp rating you want.
3) Can I use the KT3400T to change the amp rating of an existing Eaton K-frame breaker?
That is exactly what a trip unit is for on Series C K-frame breakers: the rating lives in the trip unit, and the KT3400T sets the breaker at 400A three-pole. Two cautions before you do it: the new rating has to stay within what the breaker frame and the feeder conductors are sized for, and the resulting assembly rating needs to suit the panel it is going into.
4) How much space does the KT3400T trip unit take up, and how heavy is it?
Dimensions are 6.9 x 5.4 x 4.2 inches (length, height, width) and it weighs 1.95 lb. Useful if you are checking gutter space or planning a panel swap where the breaker assembly has to clear enclosure barriers.
5) What is the exact part number to order for a 400A three-pole Eaton Series C K-frame trip unit?
Order by manufacturer part number KT3400T. In Eaton's Series C nomenclature the K indicates the K-frame, the 3 the pole count, and 400 the ampere rating, which is why an adjacent number like a 300A or two-pole version is a different part and will not give you the rating you specified.
6) Does the KT3400T come with the circuit breaker body or terminals?
No. The KT3400T is the trip unit only, the rating plug assembly that mounts to a Series C K-frame molded case breaker. The breaker body, terminal kits, lugs, and any accessories such as shunt trips or auxiliary switches are separate orders.
7) Where do I find the published specifications for the Eaton KT3400T?
Eaton publishes a dedicated spec sheet for the KT3400T, and it is linked directly from the product information. Use it when you need to confirm interrupting ratings and trip curve data for a submittal package, since those values are set by the breaker and trip unit combination rather than the trip unit alone.
How fast can I get the B-LINE KT3400T 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 KT3400T come with a warranty?
Absolutely. The B-LINE KT3400T 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 KT3400T?
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installation tips, and troubleshooting. Contact Us
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