Abstract: An adapter for a contact rail having electrical conductors and grooves provided on opposite surfaces thereof including a housing including, two lateral legs forming a recess therebetween and moveable away from each other between an open and a closed position. Electrical contacts are provided in the housing at the opposite sides of the recess and positioned for engaging with electrical conductors of the contact rail with the contact rail placed between the legs in the closed positon. At least one of the lateral legs can be moved along a straight line into a closed position such that holding elements provided on the legs engage grooves on the contact rail and the electrical contacts engage the electrical conductors of the contact rail.

Abstract: A contact rail with two conductors that are arranged on opposite sides of a transparent isolated support member and can be tapped from the outside. The support member is preferably made of glass material.