The VW3AE1902 is an additional electrical output isolation accessory from Schneider Electric, designed for Altivar floor-standing enclosures with separate air flows or compact versions — specifically the Altivar 61 Plus, 61 Plus-LH, 71 Plus, and 71 Plus-LH drive families. It requires a 24 V DC buffer voltage to operate, meaning it draws its control power from an external 24 VDC supply rather than the drive's internal bus — a detail to confirm when wiring into an existing panel's control voltage scheme.
The 24 V DC buffer voltage is the only electrical parameter on record. It governs the control interface: the accessory expects a clean 24 VDC supply, not the drive's internal 24 V.