What This Part Is and Where It Fits
The ABB XT1SU3070AYD000XXX is a molded case switch from the XT1S series, built around a 125 A frame and equipped with a TMF 70–700 A thermal-magnetic trip unit. It is designed for use in distribution panels and motor control centers where a compact, high-breaking-capacity disconnect is needed — typically as a main switch or branch feeder isolator on a DIN-rail or panel-mount assembly.