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Eaton Series C electronic molded case circuit breaker, K-frame, CKD, Complete breaker, OPTIM 550, Electronic LSIA trip, Three-pole, 125A, 600 Vac, 250 Vdc, Without terminals, 50/60 Hz, 100% rated
Manufacturer Resources
Product Specs
- Amperage Rating:
- 125A
- Certifications:
- UL Listed
- Circuit Breaker Frame Type:
- Complete breaker
- Circuit Breaker Type:
- CKD
- Frame:
- K-frame
- Frequency Rating:
- 50-60 Hz
- Interrupt Rating:
- 35 kAIC at 480 Vac, 25 kAIC at 600 Vac
- Number Of Poles:
- Three-pole
- Product Height:
- 5.5 IN
- Product Length Depth:
- 6 IN
- Product Weight:
- 11.84 LB
- Product Width:
- 5.5 IN
- Series:
- Series C
- Terminals:
- Without terminals
- Trip Type:
- Electronic LSIA
- Voltage Rating:
- 600 Vac, 250 Vdc
- Department:
- Electrical
- Performance Rating:
- 100% rated
B-LINE CKD3125T57W – Frequently Asked Questions
1) Does the Eaton CKD3125T57W circuit breaker come with lugs or terminals?
No. The CKD3125T57W ships without terminals, so you have to order the K-frame terminal kit or lugs separately to land your conductors. Plan that into the order before the breaker gets to the panel, otherwise the install stops at the line side.
2) Is this Eaton CKD breaker suitable for a 600V three-phase feeder and for DC?
It is rated 600 Vac and 250 Vdc, three-pole, at 50/60 Hz, so it covers 480Y/277 and 600V three-phase distribution as well as DC applications up to 250 volts. On 600 Vac remember the interrupting rating drops to 25 kAIC.
3) What does the OPTIM 550 electronic LSIA trip unit actually adjust?
LSIA means the trip unit gives you long-time, short-time, instantaneous and ground-fault alarm functions, rather than the fixed thermal-magnetic curve you get on a standard molded case breaker. That lets you shape the curve to coordinate with upstream and downstream devices on a selective coordination study, which is the usual reason to pick an OPTIM 550 electronic breaker over a thermal-magnetic CK.
4) Is the CKD3125T57W a complete breaker or just a trip unit replacement?
It is a complete breaker, K-frame, so you are getting the full assembly rather than a bare frame or a replacement trip unit. Terminals are the one thing not included.
5) What are the dimensions and weight of this K-frame breaker for enclosure and panel planning?
The breaker measures 5.5 inches height, 5.5 inches width and 6 inches length/depth, and weighs 11.84 lb. Check the depth against your enclosure gutter space, and note the weight if you are mounting it in a retrofit panel interior.
6) What exact part number do I order for the 125A three-pole OPTIM 550 K-frame breaker?
The manufacturer part number is CKD3125T57W: Eaton Series C, K-frame, CKD electronic breaker, three-pole, 125A, 600 Vac, OPTIM 550 LSIA trip, supplied without terminals.
How fast can I get the B-LINE CKD3125T57W 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 CKD3125T57W come with a warranty?
Absolutely. The B-LINE CKD3125T57W is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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