What it is
The ABB ACS550-U1-012A-4 is the small-frame entry in the ACS550 general-purpose drive family, sitting in the Motor Drives line under Motors & Motor Controls. It carries a listed shipping weight of 5.90 kgs — the footprint a panel builder needs to reserve before gland plate layout, since the ACS550 series scales roughly linearly in mass as current rating climbs.