The ABB XT5HQ360BQFF000XXX is a 600A breaking part from the XT5H series, configured as a 3-pole unit with F-F (fixed-fixed) terminations and UL/CSA certification. This is the interrupting section of the XT5H molded-case circuit breaker — the part that carries the arc chambers, contacts, and trip mechanism, designed to be paired with a separate base and line/load connectors.
The 3-pole configuration handles three-phase circuits (typical for motor feeders, distribution panels, or large branch circuits). UL/CSA listing means it's accepted for North American installations per UL 489 and CSA C22.2 No. 5 — no need for additional agency review on a UL 508A panel. The F-F termination style indicates fixed line and load connections, not plug-in or drawout, so it mounts directly to bus bars or cable lugs inside the enclosure.