A modular device formed with USB connectors. To improve such a shut-off device in that, especially in an emergency, fast adjustment of the shut-off organ to the closed position is possible in a constructively easy and economical manner, the actuating device comprises a gas generation device for the production of an adjustment pressure for adjusting the shut-off organ in the direction of the close position. The deep well has a second conductive type different from the first conductive type.