The VW3AE0145 is a circuit-breaker protection accessory from the Schneider Electric Altivar 71 Plus and Altivar 61 Plus range, designed for floor-standing enclosures with separate air flows or the compact version. This part is now listed as obsolete by the manufacturer.
This circuit breaker is a protection accessory specifically for Altivar floor-standing enclosures — the ones with separate air-flow paths or the compact version. It is not a general-purpose DIN-rail breaker; its mounting and bus-bar arrangement match the enclosure's internal layout. If you are retrofitting into an existing Altivar 71 Plus or 61 Plus cabinet, the VW3AE0145 is the factory-specified breaker for that enclosure variant.