Abstract: This invention relates to a switching arrangement for use in stopping or reversing an electrically driven roller door when an object lying in its path is struck during closing. The arrangement comprises a switch bar extending the width of the door curtain and projecting below its bottom edge, hinge mounting means securing the bar to the curtain and permitting swing movement about a horizontal axis, resilient loading means urging the bar into a rest position in which the lowermost bar surface is laterally displaced from the axis and a switch actuated by movement of the bar from its rest position.