Abstract: In a device (1) with a plug portion (2) and a socket portion (3) for the detachable connection particularly of the ends of high-voltage transmission lines and of the ends of low-voltage control lines, and with a mechanism for fixing the connection to prevent unintentional separation, a solution is to be provided through which the manipulation of such a coupling (3) is simplified and, particularly, a device (1) of the above-described type is made suitable also for voltages exceeding 500 volts. This is achieved by constructing the fixing mechanism as a drive element (8) which moves the device portions (2,3) relative to one another into the coupled and uncoupled positions and which locks them in the coupled position.