Reading 45.36 kg for fit, not for a spec sheet
The ACS800-04-0140-3: 45.36 kg on the listing is a handling and panel-support figure, not an electrical rating. The drive is heavy enough that a single installer should not lift it onto a top DIN row without help, and the cabinet or floor-stand must be rated for the mass plus vibration from the driven load. Treat the figure as a mounting input; the electrical class is carried on the nameplate and not reproduced here.
Where a class like this lands on a line
A frequency converter in the Motor Drives tier is the VFD that sits between the supply and an AC induction or permanent-magnet motor, handling speed/torque profile, ramp behavior, and protection. The class typically feeds a process line where soft start, controlled deceleration, or energy savings at partial load matters more than a direct-on-line contactor would give.