What it is and where it sits
The ABB ACS380-040C-07A2-4+K492 is a member of the ACS380 machinery-drive family, specified for a 3-phase 380-480 V supply. The +K492 suffix on the order string denotes a factory-fit option bundle layered onto the base 040C-07A2-4 frame, so the BOM line must be written verbatim — including the plus-code — to land the configured unit rather than the bare drive. On the panel builder's bench the drive comes in at 1.81 kg, light enough for one-handed DIN-rail or backplate mounting without a second pair of hands for the lift, but still heavy enough that the installer wants a mechanical cleat or screw-down rather than relying on the DIN-rail latch alone for a vibrating cabinet.
Same-frame alternate, different current rating
Two further ACS380 entries — ACS380-040S-06A9-2 and ACS380-040S-04A0-4 — share the same 1.81 kg weight, confirming a common chassis across the line and letting the panel cutout and mounting template stay common across frames.