What lands on the bench
The ABB ACS550-01-059A-4 is the 01-frame variant of the ACS550 series drive, the part an MRO planner names when quoting an AC drive against a BOM line that already reads ACS550-01. The 01 suffix denotes a cabinet-style chassis. At 11.79 kgs the unit is a two-hand lift into a cabinet backplate. Mount it where the heatsink gets clear airflow and keep the gland plate entries tight so the EMC story stays clean.
Cross-shop against the same family
The closest catalog-side cousin is the ACS550-U1-096A-4 at 19.96 kgs — same ACS550 series, but a different enclosure code (U1 outdoor-style) and a different current frame (096A versus 059A here), so it is NOT a panel swap for a panel cut around the 01 chassis. If the BOM was specified around the ACS550-U1-096A-4, dropping in a -01-059A-4 will move the current class, the enclosure style, and the mounting footprint — treat it as a re-spec, not a re-order, and walk the wiring diagram back through before committing the line.