The ABB XT4HU3250AJJ000XXX is a three-pole molded case circuit breaker from the XT4H series, fitted with a TMF 250-2500 thermal-magnetic trip unit. The description confirms UL/CSA listing, meaning it carries the approvals needed for North American panel builds. Rated at 250 A continuous, the TMF trip provides fixed thermal (overload) and magnetic (short-circuit) protection curves — no field-adjustable trip settings, so the breaker is specified for a fixed load profile.
Panel integration notes
Mounts on a standard DIN rail or panel-mount footprint typical of the XT4 frame. The fixed-front terminals accept copper or aluminum conductors sized for the 250 A continuous rating. Spring-cage or screw-type line/load lugs are factory-fitted per the order-code suffix; verify lug type before panel layout. The three-pole form factor occupies a single modular unit width — plan for adequate side clearance for arc-fault venting and thermal derating when grouped in a multi-breaker enclosure.