The VW3A47908 is a metal IP21 protection kit from Schneider Electric's Altivar range, designed specifically to upgrade an IP20 EMC input filter for variable speed drives to IP21 / UL Type 1 protection. The kit includes the cable clips and the IP21 cover — everything needed for the conversion in one package.
What the IP21 Rating Means for Fit
That's the standard for clean, dry indoor panel environments where the drive and filter sit inside an enclosure but the filter's IP20 base needs the cover to meet a higher plant spec or a customer's site requirement. The metal construction adds mechanical robustness over a plastic alternative.