What you're looking at
The ABB ACS355-03U-05A6-4+J404 is a low-voltage three-phase input drive rated for 3~380-480 V. The +J404 suffix is an ABB build option on the standard ACS355 ordering string, so the part number itself has to be quoted verbatim onto the BOM line. It is catalogued under Motor Drives within the broader Drives / Motors & Motor Controls family. Sourcing the exact suffix matters: ACS355 base codes share the housing and most ratings, but the trailing option designator is what changes the as-shipped configuration.
Fit and handling for the installer
Listed weight is 1.36 kg, which is a single-person panel swap and well inside the standard ACS355 mounting footprint. For a spare, that's a comfortable on-the-shelf part — no lifting plan needed and no need to derate the enclosure weight budget. First-up checks are input phase rotation, PE bonding at the gland plate, and a clean ground return at the motor frame before any autotune. Long motor cable runs are where reflected-wave voltage at the motor terminals ages the winding insulation first, so a dV/dt or sine filter is typically added when cable length outgrows the drive's rating.