The invention concerns a busbar adapter (1) with a housing; contact elements (5), on each of which an electrical connection (12) is formed and which are displaceably arranged in the housing, in such a way that the contact elements (5) can each be displaced between an extended position, in which the electrical connection (12) protrudes outwards in the region of a side face on the housing and by means of which electrical connection (12) an electrical contact to a busbar can be made, and a retracted position, in which the electrical connection (12) is arranged in the housing and the electrical contact is broken; and a single camshaft (9) which is arranged in the housing such that it can rotate and which has an arrangement of cams (10) which, for actuating the contact elements (5), are in each case assigned to at least one of the contact elements (5), in such a way that the contact elements (5) can be displaced in each case between the retracted and the extended position by rotation of the single camshaft (9). An arrangement with a busbar which has a mounting space for one or a plurality of busbar adapters and a method for connecting a busbar adapter (1) in a busbar are also provided.