What this breaker frame is and what it carries
The ABB XT1NU3060AFF000XXX is a breaker frame from the XT1N 125A platform, fitted with a thermal-magnetic fixed trip unit rated 60 A, 3-pole, 600 VAC. The fixed trip means the 60 A rating is set at the factory — no field-adjustable dials or interchangeable trip units. This is the part you spec when the load is known and the BOM needs one order code, not a frame-plus-trip-kit combination.
Mounting and panel fit
Frame-mounted design — bolts into a switchboard or panel enclosure on a mounting plate or busbar system, not a DIN rail. The front flat terminals accept lug or bus connections; plan for the panel layout around the fixed footprint of the XT1N frame.