Modular socket strip having at least two modules which are releasably connected to one another by means of a coupling device having a plug part and a plug receiving part, each module (100, 200, 300, 400, 500, 600) of the socket strip having at least one plug part and/or at least one plug receiving part for releasable connecting to at least one other module (100, 200, 300, 400, 500, 600), and wherein at least one functional element (102, 202) is arranged on each module (100, 200, 300, 400, 500, 600), wherein the plug part has a central first contact pin arranged concentrically to an axis of rotation and at least one second contact pin which has a positive-locking element and is arranged parallel to and at a distance from the central first contact pin, and the plug receiving part has a central first aperture arranged concentrically to an axis of rotation and at least one second aperture formed in particular corresponding to the at least one second contact pin, wherein the at least one second aperture has an elongated hole which extends rotationally symmetrically about the axis of rotation and which is formed, or at least one wall of the elongated hole is formed to engage with the positive-locking element of the at least one second contact pin radially to the axis of rotation, and wherein electrical contact elements (230, 231) are arranged in the plug receiving part in the region of the first aperture and in the end region of the elongated hole of the second aperture, so that the first and the at least one second contact pin of the plug part can be inserted into the first and the at least one second aperture of the plug receiving part by a movement in the direction of the axis of rotation and the plug part can then be releasably connected to the plug receiving part by a rotation about the axis of rotation, wherein the positive-locking element interacts with the elongated hole or with at least one wall of the elongated hole in order to establish the releasable connection between the plug part and the plug receiving part as well as between the contact pins (205, 206) and the electrical contact elements (230, 231), wherein the releasable connection between the positive-locking element of the at least one second contact pin and the elongated hole or at least one wall of the elongated hole is already established before the electrical connection between the at least one second contact pin and the contact elements can be established. the plug part has a central first contact pin arranged concentrically to an axis of rotation and at least one second contact pin which has a positive-locking element and is arranged parallel to and at a distance from the central first contact pin, and the plug receiving part has a central first aperture arranged concentrically to an axis of rotation and at least one second aperture formed in particular corresponding to the at least one second contact pin, wherein the at least one second aperture has an elongated hole which extends rotationally symmetrically about the axis of rotation and which is formed, or at least one wall of the elongated hole is formed to engage with the positive-locking element of the at least one second contact pin radially to the axis of rotation, and wherein electrical contact elements (230, 231) are arranged in the plug receiving part in the region of the first aperture and in the end region of the elongated hole of the second aperture, so that the first and the at least one second contact pin of the plug part can be inserted into the first and the at least one second aperture of the plug receiving part by a movement in the direction of the axis of rotation and the plug part can then be releasably connected to the plug receiving part by a rotation about the axis of rotation, wherein the positive-locking element interacts with the elongated hole or with at least one wall of the elongated hole in order to establish the releasable connection between the plug part and the plug receiving part as well as between the contact pins (205, 206) and the electrical contact elements (230, 231), wherein the releasable connection between the positive-locking element of the at least one second contact pin and the elongated hole or at least one wall of the elongated hole is already established before the electrical connection between the at least one second contact pin and the contact elements can be established.