Abstract: A switch for electric hand-tools includes: a switch housing with a switching device arranged therein; and a carriage arranged movably in the housing and which is drivable by a trigger connected thereto. The carriage is provided with at least one slider for sliding over a potentiometer track and with at least one movable contact of a mechanical switch. The switch housing is provided with an electrical connecting system which, when a module is arranged on the switch housing, is adapted to form an electrical connection between the switch housing and the module. The switch housing with the switching device arranged therein can be adapted, by connecting a module thereto, to provide an additional switch function and to adapt to a specific method of connection of the wires to be connected to the switch.