What you're sourcing
The ABB ACS800-U11-0120-5 sits in the ACS800-U11 wall-mount AC drive family, ordered here against the 120 A current frame for three-phase motor control in an industrial cabinet. It carries a listed shipping mass of 45.36 kg, so plan for a two-person lift and confirm the cabinet plinth rating before mounting. Catalog placement is Motors & Motor Controls › Drives › Motor Drives, which puts it in the same aisle as the ACS880 and ACS580 wall-mount lines when the buyer is comparing generations.
Where this class of drive lives in the panel
ACS800-U11 series units are wall-mount AC drives sized into a control cabinet — line side lands on a dedicated branch with its own disconnect, load side feeds the motor cable through a gland plate entry. The U11 frame is the compact wall-mount execution of the ACS800 platform, designed to drop onto a flat panel surface or an internal swing frame without a separate cubicle floor stand.