The ABB XT4SU3175AFF000XXX is a 2-pole XT4S 250 TMF molded case circuit breaker. This is the configuration you reach for when the load is line-to-line or line-to-neutral and you need coordinated overcurrent protection on both energized conductors.
This order code resolves to the XT4S 250 TMF platform — a compact molded case breaker sized for panelboard and distribution applications. The 2-pole variant fits standard DIN-rail or panel-mount footprints used across ABB's XT4 family, so an existing XT4 panel layout accepts this unit without busbar or enclosure modifications.