What it is on the BOM line
The ABB ACS355-03E-31A0-4 sits in the Motor Drives class and is catalogued as machinery drive hardware from the ACS355 family, ordered against the exact MPN ACS355-03E-31A0-4 for BOM line traceability. Mass on the listing is 5.40 kgs, which is the figure to carry into panel-layout and handling notes when the drive is being lifted into a cabinet or specified into a sub-assembly BOM.
Sourcing reality and lifecycle posture
ABB is listed as the brand on this order code, so cross-references and warranty paperwork resolve against ABB as the OEM of record when the part is specified into a machinery build.
Same-function peer check
ACS380-040C-032A-4+K475, ACS310-03U-50A8-2, and ACS320-03U-38A0-4 are recorded as same-class motor-drive peers; listed weights are 5.90 kgs, 5.08 kgs, and 4.40 kgs respectively.