What this drive is
The ABB ACS355-03E-31A0-2 is a machinery drive from the ACS355 series, specified for a 200 … 240 V three-phase supply at 47.5 … 63 Hz, and built around the R4 frame at 260 mm wide × 181 mm tall × 169 mm deep. Enclosure rating is IP20 in the open-type NEMA configuration, which means the module must be mounted inside a higher-IP cabinet — not on a washdown machine skin — with the usual ACS355 clearance rules for side-by-side R4 units. Mounting class is the module style common across the ACS355 line, so existing ACS355 cabinet brackets and backplate cutouts sized for R4 apply.
Ratings that decide the fit
R4 frame at 260 mm wide and 181 mm tall is the layout-driving number for the cabinet build — depth of 169 mm is the figure to check against the backplate-to-door allowance — and shipping weight lands at 4 kg, in line with the rest of the R4 ACS355 bracket.
Where this class of drive sits
ACS355 machinery drives are the ABB platform panel-builders reach for on standalone machine skids — conveyors, mixers, packaging lines, small pumps — where IP20 module-mount construction, three-phase low-voltage input, and a compact R-class footprint fit a standard enclosure. Open-type IP20 construction means EMC, filtering and finger-safe guarding are the cabinet's job, not the drive's, and the drive relies on the external earth-bond and cable routing for conducted-noise control — treat the cabinet, not the drive, as the EMC boundary.
Sourcing posture
No official successor order code is listed for ACS355-03E-31A0-2; confirm any newer ABB cross-reference against the current ACS355 catalog before substituting.