What it is and where it fits
The ABB XT4HU3200AYJ000XXX is a NEXT4H 250 molded case circuit breaker, 3-pole, fitted with a TMF (thermal-magnetic fixed) trip unit rated 200-2000 A, UL/CSA listed. The TMF trip provides fixed thermal and magnetic protection curves — no field-adjustable dials, so the trip setting is locked at the factory rating. This makes it a straight swap for a BOM line that already specifies the 200-2000 A TMF block.