Reading the order code
The ACS355-03U-15A6-4+J404: Listed under Motors & Motor Controls › Drives › Motor Drives, so it reads as a general-purpose VFD rather than a dedicated motion or servo product.
What the ratings mean for fit
At 2.72 kgs the unit sits in the compact wall-mount class — light enough for a single installer to handle, heavy enough that the panel layout needs to account for the mass on a flat metal backplate rather than a DIN-rail clip in a swing frame. The listed figure is the bare weight, not shipping weight, so a planning estimate should add packaging for logistics.