What this drive is on the BOM
The ABB ACH580-01-045A-4 sits in the ACH580 series of three-phase wall-mount drives, ordered against the motor-drive line for HVAC and industrial pump/fan applications, and is what a panel builder mounts when the BOM calls for a mid-frame ACH580 at the 045A current rating. The frame and listing put it next to the 014A and 023A siblings in the same 01 wall-mount chassis; the chassis itself is the lever a panel builder pulls when sizing gland plates and DIN real estate.
Reading the headline number
The 045A suffix is the drive's continuous output current rating, not its frame size; the -01 in the code marks the IP21 wall-mount form factor ABB uses across the 014A, 023A, and 045A slots in this series.