My parts list/tender specifications

Busch-Jalousiecontrol® II Cut-Off Relay Venetian blind 12 ... 48 V DC

Data Sheet:

For jointly switching 2 blind drives via a 230 V contact maker (UP/DOWN) (e.g. 6411 U/x-101). For grouping more than 2 blinds, several cut-off relays can be controlled parallel. For installation in commercially available SM-or flush mounted boxes. The device requires an external supply voltage of 12-48 V DC.