The Siemens SENTRON 3VA9088-0VM30 is a rear interlock accessory for 3VA1 and 3VA2 plug-in and draw-out units rated up to 630 A. It mechanically prevents the unit from being inserted or withdrawn when the main contacts are closed, enforcing a safe sequence for panel maintenance and swap-out without a full de-energization.
Integration note
This rear interlock mounts to the 3VA1 or 3VA2 molded-case switch frame. It does not alter the panel cutout or DIN-rail footprint — the interlock rod engages the operating mechanism through the existing escutcheon opening. Verify the rod length matches the enclosure depth before committing the BOM line.