Abstract: For the mechanical coding of parts which can be joined together, it is proposed that the parts be connected to, in each case, one of two coding elements which belong together, the said coding elements being constructed as a one-piece coding module and being held together by means of web-like connections, and the connectable parts being divided up, after being joined together, into two coded releasable parts.

Abstract: For a switch connector with contact elements disposed in contact cavities of an insulator body, with contact elements with at least one spring-elastic arm in the contact cavities, and in which contact blades of a corresponding mating connector can be inserted in the contact cavities and thus make contact with the contact elements and in which there is provided at least one shorting jumper which short-circuits two contact elements in the absence of an inserted mating connector, the short circuit being broken when the blade contacts are inserted in the contact cavities, it is proposed that the shorting jumper is designed as a rigid contact part and has at least one contact limb which is disposed between the contact spring limbs of the contact elements and that in the contact cavities there is a switching element provided with a switching spring limb, the switching spring limb acting on the contact spring limb of the contact element in such a way that the latter is displaced until the switching spring limb bears