The ABB XT4NU3250AJJ000XXX is a 1-pole molded case switch from the XT4N 250 TMF series, designed for panel mounting. It's a straightforward disconnect or isolation device for a single-phase circuit — no overcurrent protection built in, just a switch rated to break load current under normal conditions.
Panel-mount integration
Panel mounting means it bolts into a cutout on the enclosure backplate or sub-panel — no DIN rail. Plan for the footprint and the drilling template; the switch body is sized for a standard panel opening. The single-pole configuration keeps the wiring tidy: line in, load out, no interphase bussing.