The VW3A9551 is an empty enclosure kit that adds 800 mm of vertical extension to an existing ATV61 or ATV71 drive cabinet. It is an installation accessory — not a standalone cabinet, but a bolt-on section that gives you more internal volume for additional options, contactors, or terminal blocks without reworking the main enclosure. Cable entry is via the enclosure bottom or from the left. Colour code is RAL 7022 for the plinth and RAL 7032 for the case. Ambient temperature rating is 0 to 45 °C outside the enclosure and 0 to 50 °C inside the enclosure, so the added section does not reduce the drive's thermal headroom as long as internal airflow is maintained.
Because the ATV61 and ATV71 drive families are themselves mature or phased out, the VW3A9551 is typically sourced as a working pull from a decommissioned cabinet. These enclosures are built to last; the steel and paint hold up well, and the mechanical fit is standard for the series. Cosmetic condition varies, but the structural integrity is usually sound.