What you're sourcing
The ABB ACS550-01-031A-4 is an AC drive from the ACS550-01 series, sitting in the ABB Motors & Motor Controls / Motor Drives line at 18.00 kgs chassis weight — the kind of part a buyer lands on when a panel slot, a spare shelf, or a repair swap needs an exact order code, not a 'close enough' alternative. The -01 in the code marks the wall-mount/IP21 industrial enclosure family rather than the -U1 UL Type 1 or the -U2 cabinet-drive packages, so footprint and gland-plate layout follow that convention — useful context for the panel builder and the field tech who has to mount the replacement the same way the original sat.
What the ledger actually tells us
The ledger lists only two grounded numbers for this MPN: the order code ACS550-01-031A-4 and the 18.00 kgs chassis weight. Current, voltage class, and motor kW ratings are not present in the spec row on file.
Cross-shop reality vs the ACS550-U1-096A-4
The newer-platform peer ACS580-01-065A-4 (19.05 kgs) is the ABB general-purpose successor family, not a same-frame alternate — it changes the parameter structure, the control panel, and the macro library, so it is an upgrade path, not a wire-for-wire swap for an existing ACS550 commissioning.
Sourcing posture
Specify the exact order code ACS550-01-031A-4 with the -01 enclosure suffix and verify the inbound unit against the 18.00 kgs figure before releasing to the panel builder.