What this drive is
The ABB ACS800-U31-0120-5+E200+K466 is a 125 HP-class wall-mount drive in the ACS800-U31 family, with the option string +E200 +K466 already baked into the order code. It sits in the Motors & Motor Controls > Drives > Motor Drives line, so it is a variable-frequency drive intended for direct three-phase motor control, not a soft starter or servo. Listed mass is 99.79 kgs — plan a lifting rig and a floor-anchored cabinet before any swap, because a single tech is not moving this by hand.
Frame class vs the cross-shop candidates
Against the ACS880-01-156A-5 at 55.00 kgs and the ACS580-01-180A-4 at 54.43 kgs, the ACS800-U31-0120-5 sits in a heavier wall-mount frame class — same approximate horsepower band, different mechanical envelope. The ACS550-U1-157A-4 listed at 89.81 kgs is the closer legacy peer for weight, which matters when the panel cutout and mounting rails were laid out for an ACS550-U1 generation and a buyer is checking whether the ACS800 family drops in on the same footprint.