What this breaker is and where it lands
The ABB XT1NU3050AAA1A0XXX is a 3-pole molded case circuit breaker in the Tmax XT1N frame, rated 50 A continuous at 480 VAC. It uses a fixed thermal-magnetic trip unit — no interchangeable trip block — so the 50 A rating is built in. Panel-mount construction means it bolts into a switchboard or distribution panel, not a DIN rail. The 50 A rating suits motor branch-circuit protection at 480 VAC. The 3-pole configuration covers three-phase circuits; the frame is rated for 600 VAC.
Integration note
Panel mount — the breaker bolts directly to a backplate or busbar system. The extended front terminals (part of the order-code suffix) provide extra clearance for lug connections and make wiring easier in a crowded enclosure. No DIN-rail adapter; plan for drilling and tapping the mounting holes.