The ABB XT4NU3225AFF000XXX is a 3-pole molded case circuit breaker on the XT4N 250 A frame, rated 225 A continuous at 600 VAC. Panel-mount construction bolts directly into the switchboard or distribution panel; no DIN-rail adapter needed.
Where it goes in the panel
Panel-mount footprint means it bolts to a backplate or mounting pan — not a snap-on DIN-rail breaker. Plan for a cutout or mounting holes per the ABB XT4N template. The 225 A rating and 3-pole configuration suit it for feeder protection in a 480Y/277 V or 600 V distribution panel, feeding downstream branch circuits or a motor control center bucket.