part 12 it is significant for this invention that circuit board contact 8 front bus contact 9 and rear bus contact 10 are composed of a continuous piece of flat electrically conductive material this is especially apparent from fig2 in which an intermediate stage of production is shown circuit board contact 8 in the embodiment shown is made as a so called tulip shaped contact receiver for this reason it has two contact legs 16 17 which open outwardly it follows especially from fig1 that the circuit board contact 8 is aligned such that circuit board 4 is located roughly transversely to longitudinal direction l of the mounting rail as is apparent from fig4 the front bus contact 9 is made in the form of a contact blade and the rear bus contact 10 in the form of a contact receiver the bus contacts 9 10 themselves are aligned parallel relative to the longitudinal direction l of the mounting rail in the housing 3 or base part 12 so that front bus contact 9 of an adjacent electronic device 1 can be easily inserted into the contact receiver of rear bus contact 10 the contact is outwardly flared proceeding from its central longitudinal axis m conversely the contact.