The VW3A21801 is a Vario switch disconnector kit for the Altivar 212 drive series, classified as a mounting plate accessory. It's designed to integrate the switch disconnector into an IP54 enclosure — essentially the bracket and hardware to mount the disconnect alongside the drive in a single cabinet.
Schneider lists this kit as obsolete. If you're holding a BOM line for a new build, the Altivar 212 itself is a legacy platform — the kit went with it.
What it fits and why it matters
This bracket is specific to the Altivar 212 form factor. It's not a generic DIN-rail mount; it's the metal plate that lets you bolt the Vario disconnect handle and interlock mechanism into the same footprint as the drive. If you're retrofitting a panel that already has the drive and needs the disconnect integrated, this is the factory part — no drilling, no adapter plate.