A collecting rail system provides a bus bar with a floor part and a cover part made from an isolating material. The floor part features at least two chambers for the accommodation of respectively one terminal track, whereby between respectively two chambers a chamber separating wall is disposed, and whereby connector tabs are disposed on the terminal tracks such that the cover part can be placed on the floor part in such a manner that the terminal tracks are covered up and the connector tabs protrude through openings in the cover part. As a result of this arrangement, the floor part as well as the cover part are manufactured by means of an operative extrusion process and the openings are subsequently placed, in particular stamped, into the cover part, whereby an isolating element, which is insertable into an opening and which penetrates, in the inserted state, through the opening and which features a case. The case is disposed with which is at least one separating wall, preferably two separating walls, which are positioned between two neighboring connector tabs when the cover part is placed on the floor part and the isolating element is inserted into the opening.