What you're actually sourcing
The ABB ACS800-U1-0004-5+N660+P901 is a wall-mount single-drive in the ACS800-U1 family, ordered with the +N660 and +P901 factory option codes applied to the base 0004-5 rating slot. It carries a listed mass of 9.07 kgs on this Motor Drives line, which puts it on the lighter end of the U1 wall-mount frame and well inside single-installer lift territory for cabinet mounting. The order code string is the part to specify — base frame, variant slot, and option suffixes travel together as one BOM line.
Frame class and what it means for the panel
ACS800-U1 units are wall-mount drives for cabinet mounting. At 9.07 kgs the unit is within single-person handling, and the U1 chassis still wants clearance above and below for cooling airflow.