A coupling system for a rail vehicle, comprising an electric coupler with: a coupler housing, a contact carrier structure attached to the coupler housing, and a plurality of electrical contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) which are mounted on the contact carrier structure and which each have one of a plurality of different functions, wherein the contact carrier structure can be assembled from several separate contact carrier inserts (44a, 44b, 46a, 46a, 48a, 48b, 50a, 50b, 68, 70), characterized in that on each of the separate contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70) from the plurality of electrical contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) only those that have the same function are mounted, the separate contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70) from which the contact carrier structure can be assembled, are formed of functional pairs which each comprise two contact carrier inserts, the contacts of which (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) have the same function, the coupling system comprises a manual connector (36, 38) which is arranged outside the coupler housing and has several contact inserts with each time at least one electrical contact which is connectable to one of the contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) of one of the contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70), and the coupling system can be assembled from several modules which are mountable independently from one another, each module comprising at least two of the contact carrier inserts (68, 70) that form a functional pair, and at least one of the contact inserts of the manual connector (36, 38) as well as a first electrical connection between the two contact carrier inserts (68, 70) and a second electrical connection between one of the two contact carrier inserts and the contact insert of the manual connector (36, 38). a coupler housing, a contact carrier structure attached to the coupler housing, and a plurality of electrical contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) which are mounted on the contact carrier structure and which each have one of a plurality of different functions, wherein the contact carrier structure can be assembled from several separate contact carrier inserts (44a, 44b, 46a, 46a, 48a, 48b, 50a, 50b, 68, 70), characterized in that on each of the separate contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70) from the plurality of electrical contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) only those that have the same function are mounted, the separate contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70) from which the contact carrier structure can be assembled, are formed of functional pairs which each comprise two contact carrier inserts, the contacts of which (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) have the same function, the coupling system comprises a manual connector (36, 38) which is arranged outside the coupler housing and has several contact inserts with each time at least one electrical contact which is connectable to one of the contacts (54a, 54b, 56a, 56b, 58a, 58b, 60a, 60b) of one of the contact carrier inserts (44a, 44b, 46a, 46b, 48a, 48b, 50a, 50b, 68, 70), and the coupling system can be assembled from several modules which are mountable independently from one another, each module comprising at least two of the contact carrier inserts (68, 70) that form a functional pair, and at least one of the contact inserts of the manual connector (36, 38) as well as a first electrical connection between the two contact carrier inserts (68, 70) and a second electrical connection between one of the two contact carrier inserts and the contact insert of the manual connector (36, 38).