What lands on the shelf
The ABB ACS800-04-0050-7+P901+Q967 is the wall-mount member of the ACS800-04 low-voltage drive family, option-coded with +P901 and +Q967 and rated for 51 A input current on the line side. Mass on the data plate is 34.02 kg, which is the threshold where the unit goes from a one-person lift to a two-person panel-mount job and the cabinet has to be sized for the static load before the drive is bolted in.
What 51 A input actually means on the BOM
51 A is the figure that sizes the upstream branch protection and the supply cable, not the motor's full-load amps — the output side is governed by the motor nameplate and the drive's own current limit, both of which are parameter-driven rather than nameplate-driven. Treat the 51 A as the line-side design point and walk back the cable, breaker, and contactor from there before commissioning.