The ABB XT4HQ3100BFF000XXX is a molded case circuit breaker from the XT4H series, built on a 250 A frame with a TMA 100 electronic trip unit adjustable from 500 to 1000 A. It is a three-pole unit with fixed thermal-magnetic protection, front-face terminals, and UL/CSA certification — meaning it is listed for North American panel builds and meets the short-circuit current ratings required by UL 489.
The 250 A frame and 500..1000 A adjustable trip range mean this breaker covers motor feeders, transformer primaries, or main distribution panels where the load current falls between those limits. The TMA trip unit gives you thermal memory for overload and magnetic pickup for short-circuit — standard for general-purpose power distribution. UL/CSA listing is the key authority signal: it is accepted in panel shops that must pass a UL 508A or CSA C22.2 inspection.