The invention relates to a switch device (100) comprising a lever (112) which co-operates with electric contact surfaces (110, 110', 111, 111'). The aim of the invention is to enable an input device to be temporarily disconnected by hand. Said aim is achieved by virtue of the fact that the lever (112) co-operates with two contact surfaces (110, 110', 111, 111'), which can be connected together in an electrically insulating manner by means of two contact devices (113, 113') which are electrically insulated from each other, in order to electrically connect two electric circuits (114, 114') which are independent from each other. Said connections can be simultaneously interrupted.
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