The XT2HU3050AFF000XXX: Three-pole construction, so it switches all three phases simultaneously in a 3-phase system. The fixed configuration means the breaker ships as a single assembly — the line and load lugs are integral, not modular add-ons.
UL/CSA listing and what it means for panel acceptance
Listed to both UL and CSA standards, which covers installations in the US and Canada under NEC and CEC. For a panel builder, that listing is the difference between a breaker that passes inspection and one that gets flagged — no separate evaluation report needed for most standard distribution panels. The XT2H 125 series is ABB's compact MCCB line, sized to fit in the same panel footprint as the older SACE Tmax series but with a higher interrupting capacity in the same frame. For a retrofit or a new build, the mounting hole pattern and bus bar spacing are consistent across the XT2 family.