The VW3AE0621 is a motor choke from Schneider Electric, designed as a protection accessory for the Altivar 61 Plus and Altivar 71 Plus drive ranges. It mounts in the floor-standing enclosure variant with separate air flows or the compact version — so if you are retrofitting a motor choke into an existing Altivar 61/71 Plus cabinet, this is the part that fits the enclosure footprint.
This is a motor choke, not a line reactor or dV/dt filter — its job is to limit the rate of voltage rise (dV/dt) at the drive output, protecting motor winding insulation on longer cable runs. In an Altivar 61/71 Plus floor-standing enclosure, it bolts into the designated mounting location; the separate-air-flow design keeps the choke's heat out of the drive's main cooling path.