Busbar adapter, with: - a housing; - contact elements, on each of which an electrical terminal is formed and which are arranged displaceably in the housing, in such a way that the contact elements are displaceable respectively between an extended position in which the electrical terminal protrudes on the outside in the area of a side surface on the housing and an electrical contact can be formed as a busbar by means of the electrical terminal, and a retracted position in which the electrical terminal is arranged in the housing and the electrical contact is detached; and - a single camshaft which is rotatably arranged in the housing and has an arrangement of cams which, for actuating the contact elements, are respectively associated to at least one of the contact elements, such that through rotation of the single camshaft the contact elements can be displaced respectively between the retracted and the extended position; wherein at least one first cam of the arrangement of cams for actuating two of the contact elements, which are arranged on opposite sides with respect to the single camshaft, is jointly associated, such that in different rotary positions of the single camshaft exactly one of the two contact elements is displaced in the extended position by means of the first cam, characterized in that the contact elements in the housing extend essentially in the longitudinal direction, the single camshaft being rotatable about an axis of rotation in the housing which extends essentially transversely to the longitudinal direction, and wherein the busbar adapter is adapted to be inserted into a mounting space of a busbar in such a way that the longitudinal direction of the housing extends parallel to a longitudinal direction of the busbar. - a housing; - contact elements, on each of which an electrical terminal is formed and which are arranged displaceably in the housing, in such a way that the contact elements are displaceable respectively between an extended position in which the electrical terminal protrudes on the outside in the area of a side surface on the housing and an electrical contact can be formed as a busbar by means of the electrical terminal, and a retracted position in which the electrical terminal is arranged in the housing and the electrical contact is detached; and - a single camshaft which is rotatably arranged in the housing and has an arrangement of cams which, for actuating the contact elements, are respectively associated to at least one of the contact elements, such that through rotation of the single camshaft the contact elements can be displaced respectively between the retracted and the extended position; wherein at least one first cam of the arrangement of cams for actuating two of the contact elements, which are arranged on opposite sides with respect to the single camshaft, is jointly associated, such that in different rotary positions of the single camshaft exactly one of the two contact elements is displaced in the extended position by means of the first cam, characterized in that the contact elements in the housing extend essentially in the longitudinal direction, the single camshaft being rotatable about an axis of rotation in the housing which extends essentially transversely to the longitudinal direction, and wherein the busbar adapter is adapted to be inserted into a mounting space of a busbar in such a way that the longitudinal direction of the housing extends parallel to a longitudinal direction of the busbar.