The ABB XT1HQ3100AAA000XXX is a 3-pole molded case circuit breaker from the XT1H series, built around a 125 A frame and fitted with a TMF 100-1000 A thermal-magnetic trip unit. The fixed thermal-magnetic design means the overload and short-circuit protection curves are factory-set — no interchangeable trip modules to source later, which simplifies BOM management for panel builders who want a single line-item per breaker rating.
The 125 A frame with a TMF 100-1000 A trip unit covers a wide continuous-current range — the trip can be adjusted from 100 A up to 1000 A, making this one breaker that can serve multiple load sizes in a panel. The 3-pole configuration handles three-phase circuits (typical motor, feeder, or distribution loads). UL and CSA marks confirm the breaker meets North American listing requirements for branch-circuit protection; the fixed front terminals (F F in the description) accept standard bus bar or cable connections without adapter kits.