250 A, 600 VAC, 3-Pole — XT4H Frame with EKIP LSI Trip
The ABB XT4HU3250FFL000XXX is a molded case circuit breaker in the XT4H frame, rated 250 A continuous at 600 VAC, 3-pole, with the 250 EKIP LSI electronic trip unit. The LSI designation means the trip provides Long-time, Short-time, and Instantaneous protection curves — adjustable for selective coordination in a distribution panel. The F F suffix indicates UL/CSA certification, so this breaker is accepted in North American panelboards and switchgear without additional listing work.
Panel Integration and Mounting
Mounts in a standard ABB XT4 draw-out or fixed cradle; the frame accepts plug-in or fixed connections depending on the base ordered separately. The 3-pole footprint occupies one 3-pole space in a distribution panel. Torque terminal connections to the values stamped on the breaker nameplate — the EKIP trip unit draws its power from the line-side current transformers, so no auxiliary control power is needed for the protection functions.
What the 250 A Rating Means for Your Application
The 250 A continuous rating is the breaker's maximum uninterrupted current at 40 °C ambient. In a feeder circuit, size the upstream transformer or bus for at least 250 A; for motor branch circuits, the breaker must be coordinated with the motor full-load current per NEC 430. The EKIP LSI trip unit allows the short-time pickup and delay to be set so the breaker holds through a downstream fault long enough for the branch breaker to clear — selective coordination without nuisance tripping.