B-Line Eaton Series C electronic , K-, CHKD, Complete , OPTIM 550, Electronic LSI trip type, Three-pole, 125A, 600 Vac, 250 Vdc, 65 kAIC at 480 Vac,

No. The CHKD3125T52W K-frame breaker ships without terminals, so you have to order the line and load lugs or terminal kits separately for the K-frame. Budget for that before the install day, because the breaker cannot be landed on cable as shipped.

Yes. It is a 100% rated breaker at 125A, so in the proper enclosure it can carry its full nameplate current continuously rather than being derated to 80 percent. That matters on continuous loads like lighting panels or large motor feeders, where an 80% rated 125A device would only be good for 100A continuous.

The interrupting rating is 65 kAIC at 480 Vac, so it covers services with available fault current up to 65 kA at 480. Voltage rating is 600 Vac and 250 Vdc, and it is rated for 50/60 Hz systems. If your short circuit study shows more than 65 kA at the 480V bus, you need a higher AIC frame or a series-rated combination.

LSI stands for long-time, short-time and instantaneous. The OPTIM 550 unit on this CHKD breaker gives you adjustable long-time and short-time settings so you can coordinate selectively with upstream and downstream devices instead of tripping the main every time a branch faults. A thermal-magnetic breaker has a fixed curve and no short-time band. There is no ground fault (G) function on an LSI unit, so if the drawing calls for GF protection at this breaker, you need an LSIG device.

It is a complete breaker: the K-frame housing, three poles and the OPTIM 550 electronic trip unit together as one assembly. You are not ordering a bare frame or a standalone rating plug.

The breaker body measures 5.5 x 5.5 x 4.1 inches and weighs 11.5 lb. Allow for the terminal kit and cable bending space beyond that footprint, since the device ships without terminals. At 11.5 lb it is a two-hand lift into a live gear opening.

The CHKD Series C breaker is UL Listed. For institutional specs, pair that with the 65 kAIC at 480 Vac interrupting rating and the 100% continuous rating when you check it against the panel schedule.

Order it as Eaton CHKD3125T52W. That designation carries the K-frame CHKD type, three poles, 125A and the OPTIM 550 electronic LSI trip unit without terminals. Terminal kits are a separate line item.

Yes, the voltage rating covers 250 Vdc as well as 600 Vac, so it can be applied on DC systems up to 250 volts. Confirm pole configuration requirements for your DC application, as the device is a three-pole breaker.