Contacting element (40, 50, 60) for electrical and mechanical connection to a luminaire or to an electrical unit on a support rail which has a support rail profile comprising two side walls and at least one conductor rail which is arranged on one of the two inner sides of the side walls of the support rail profile and has electrically contactable lines, the contacting element (40, 50, 60) being insertable into the support rail profile and having connection contacts (42, 52, 62) which are adjustably mounted so as to abut against lines of the conductor rail in a state in which the contacting element (40, 50, 60) is inserted into the support rail profile, the contacting element (40, 50, 60) having at least one linearly laterally adjustable contact block (41, 42, 51, 52, 61,62) comprising connection contacts (43, 53, 63), which contact block is adjustable between an open position, in which it is possible to insert and remove the contacting element (40, 50, 60) from the support rail profile, and a contacting position, in which the contact block (41, 42, 51, 52, 61, 62) comprising the connection contacts (43, 53, 63) is laterally extended to contact the lines, the contacting element (40, 50, 60) having two contact blocks (41, 42, 51, 52, 61, 62) comprising connection contacts (43, 53, 63) which point in opposite directions, the two contact blocks (41, 42, 51, 52, 61, 62) being coupled in such a way that they can be transferred, starting from the open position, away from one another into the contacting position, characterized in that the two contact blocks (61, 62) are mounted in a pre-tensioned manner in the contacting position, pressing or actuating elements (71, 72) being arranged on the contacting element, which pressing or actuating elements enable the contact blocks (61, 62) to be manually pressed together into the open position. the contacting element (40, 50, 60) being insertable into the support rail profile and having connection contacts (42, 52, 62) which are adjustably mounted so as to abut against lines of the conductor rail in a state in which the contacting element (40, 50, 60) is inserted into the support rail profile, the contacting element (40, 50, 60) having at least one linearly laterally adjustable contact block (41, 42, 51, 52, 61,62) comprising connection contacts (43, 53, 63), which contact block is adjustable between an open position, in which it is possible to insert and remove the contacting element (40, 50, 60) from the support rail profile, and a contacting position, in which the contact block (41, 42, 51, 52, 61, 62) comprising the connection contacts (43, 53, 63) is laterally extended to contact the lines, the contacting element (40, 50, 60) having two contact blocks (41, 42, 51, 52, 61, 62) comprising connection contacts (43, 53, 63) which point in opposite directions, the two contact blocks (41, 42, 51, 52, 61, 62) being coupled in such a way that they can be transferred, starting from the open position, away from one another into the contacting position, characterized in that the two contact blocks (61, 62) are mounted in a pre-tensioned manner in the contacting position, pressing or actuating elements (71, 72) being arranged on the contacting element, which pressing or actuating elements enable the contact blocks (61, 62) to be manually pressed together into the open position.