The VW3AE2003 is a Pt100 relay designed to monitor motor winding temperature via Pt100 sensors, intended for use in Altivar floor-standing enclosures with separate air flows or the compact version. This relay sits in the Altivar 71 Plus-LH, Altivar 61 Plus-LH, Altivar 61 Plus, and Altivar 71 Plus drive ranges.
Schneider Electric lists the VW3AE2003 as obsolete.
The 24 V DC buffer voltage is the supply for the relay coil and the Pt100 measurement circuit — if your drive cabinet or control panel provides a different control voltage, you will need an interposing relay or a separate 24 V DC supply. This is a Pt100 relay for motor winding protection, not a general-purpose relay — it is designed to interface with Pt100 RTD sensors embedded in motor windings, so it expects a specific resistance-temperature curve and will not work with thermistors or other sensor types. The relay is an accessory for Altivar floor-standing enclosures with separate air flows or compact versions — it mounts inside the drive cabinet, not on a DIN rail in a separate panel.