The VW3AE0144 is a circuit breaker accessory for the Altivar 61 Plus and Altivar 71 Plus drive ranges, designed specifically for floor-standing enclosures with separate air flows or the compact version. It's a protection accessory that mounts inside the drive cabinet to provide overcurrent protection for the drive input.
This part is obsolete per the manufacturer. If you're standardizing on an Altivar 61 or 71 Plus cabinet, verify whether the replacement drive family (Altivar Process or Altivar 32) uses the same breaker footprint; the enclosure interface changed with the ATV900 series.
Mounts inside the Altivar floor-standing enclosure. The breaker ties into the drive input bus, so panel layout and wire routing follow the drive's internal gland-plate and bus-bar scheme. If you're retrofitting into an existing cabinet, check that the breaker's physical footprint matches the mounting holes and bus spacing on the older ATV61/71 backplate.