The ABB XT4HU3225AFF00NXXX is a 3-pole molded case circuit breaker from the XT4H 250 A frame series, fitted with a TMF (thermal-magnetic fixed) trip unit rated 225 A and adjustable from 225 to 2250 A. The listing carries UL and CSA approvals, so it is accepted for panel builds in North American markets without additional agency review.
What the Ratings Mean for Fit
The 225 A TMF trip unit is a thermal-magnetic fixed type with a fixed trip curve. The 250 A frame provides headroom for the 225 A continuous rating.
Panel Integration
The XT4H frame mounts in a standard panel via screw-mount or optional DIN-rail adapter. Three-pole configuration with front-facing terminals accepts copper or aluminum conductors up to the lug rating. The F F suffix indicates fixed front terminals (line and load) — no plug-in or draw-out mechanism, so it is a direct-wire install for fixed-mount switchboards or distribution panels.