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Eaton molded case circuit breaker accessory trip unit
Manufacturer Resources
Product Specs
- Amperage Rating:
- 125A
- Auxiliary Switch:
- LSI
- Compliances:
- Contact Manufacturer
- Frame Size:
- Frame J-K
- Number Of Poles:
- Three-pole
- Product Height:
- 4.12 IN
- Product Length Depth:
- 6.5 IN
- Product Weight:
- 5.24 LB
- Product Width:
- 3.5 IN
- Protection:
- Non-ground fault
- Series:
- Series C
- Department:
- Electrical
- Product Type:
- Trip unit
- Product Details:
- Trip unit
B-LINE KEP3125T52 – Frequently Asked Questions
1) What frame size breaker does the Eaton KEP3125T52 trip unit fit?
The KEP3125T52 is built for Eaton Series C molded case circuit breakers in the J-K frame range. If the breaker in your panel is a different frame (F, L, N and so on), this unit is not the right part for it.
2) What amperage and pole configuration is the KEP3125T52 rated for?
125 amps, three-pole. Ordering it for a two-pole breaker or for a different amp rating means the trip unit will not match the breaker it is going into, so the frame, poles and amp rating all have to line up.
3) Does the Eaton KEP3125T52 trip unit include ground fault protection?
No. It is a non-ground-fault trip unit with LSI protection, meaning long-time, short-time and instantaneous functions only. If your feeder needs equipment ground fault protection, you need a ground fault (LSIG) trip unit instead.
4) Is the KEP3125T52 a complete circuit breaker or just the trip unit?
Just the trip unit. It is the interchangeable rating plug/trip assembly that mounts to an Eaton Series C molded case breaker, not the breaker itself. You need a matching J-K frame Series C breaker body for it to do anything.
5) What does LSI mean on an Eaton Series C trip unit, and is it enough for a feeder breaker?
LSI covers long-time, short-time and instantaneous tripping. Long-time handles sustained overload, short-time lets you coordinate with downstream devices on a time delay, and instantaneous clears a hard fault immediately. That combination is what most feeder applications are selectively coordinated with. What LSI does not give you is ground fault sensing, and the KEP3125T52 is specifically a non-ground-fault unit.
6) How big is the Eaton 125A trip unit, and how much does it weigh?
It measures 4.12 inches high, 3.5 inches wide and 6.5 inches in length/depth, and weighs 5.24 lb. Worth checking against the gutter space and cover clearance in the enclosure before you commit, particularly on a retrofit into an existing panel.
7) What exact part number should I order for a 125A three-pole Series C J-K frame trip unit?
Order Eaton part number KEP3125T52. That is the manufacturer part number for the 125 amp, three-pole, non-ground-fault LSI trip unit in the Series C J-K frame line.
How fast can I get the B-LINE KEP3125T52 delivered?
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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 KEP3125T52 come with a warranty?
Absolutely. The B-LINE KEP3125T52 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 KEP3125T52?
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