A device for closing or opening two or more main switches of corresponding electrical power supply circuits of related electrical devices includes a plate having at least two capacitive touch contact areas, and a control circuit configured to control two or more additional switches so that, in the event that only one of the contact areas is touched, only the corresponding main switch is opened or closed, while in the event of a combined touching of at least two of the contact areas, one of the additional switches is opened or closed.