The ABB XT3SU3150MFF000XXX is a 3-pole motor circuit protector (MCP) from the XT3S 225 family, rated for 150 A continuous. The 'F F' form factor and UL/CSA marking mean it's built for North American panel construction — UL 489 listed as a manual motor controller and branch-circuit protector combined. That single device handles both short-circuit and overload protection for a motor branch, so you skip a separate fused disconnect.
The 150 A setting on the XT3S 225 frame covers motor full-load currents in the 100–150 A range — typical for a 75–100 HP motor at 480 V three-phase. The 3-pole configuration handles three-phase motor loads; the 'F F' form factor indicates fixed thermal and fixed magnetic settings, so the protection curve is set at the factory and cannot be field-adjusted.