A plug-in connector comprising a plug and a plug socket with a shroud (1) serves to connect a cable containing a plurality of signal lines and current supply lines to a consumer, e.g. the electronic regulator of a vehicle control system. The inside of the plug-in connector is a water-tight housing in which the contacts of the plug engage the connecting contacts of the plug socket (2-6) when plug and plug socket are assembled. According to the present invention, intermediate walls (7,8) divide the interior of the housing into at least three spaces which are separated from each other in a liquid-tight manner. At least one of said spaces is provided for the signal line contacts (6) and at least one each is provided for current supply contacts having the same electrical potential (2,3; 4,5). The current supply contacts are arranged on the end faces of the plug-in connector in such a way that they are separated according to their electrical potential.