What the part is
The ABB ACH580-01-073A-4 is a three-phase drive in the ACH580-01 series, cataloged under Motors & Motor Controls › Drives › Motor Drives. The listed weight on this drive is 8.62 kgs. In the ACH580-01 series housing, the -073A frame sits above the lower-current -014A and -023A units (each listed at 6.80 kgs), so the 8.62 kgs figure tracks a heavier frame built for a higher current step rather than a different sub-family.