The ABB XT1SU3100AFF000XXX is a 3-pole molded case circuit breaker from the XT1S 125 TMF family, rated 100 A continuous at 480 VAC. Panel-mount construction, so it bolts into a switchboard or distribution panel rather than snapping onto a DIN rail.
Panel-mount form factor means the breaker mounts directly to a backplate or sub-panel with bolts, not a DIN rail. The XT1S 125 TMF frame is a compact 3-pole design, so it fits standard MCCB cutouts in switchboards and distribution panels. Terminal connections accept copper or aluminum conductors sized for the 100 A rating.
