Electrical switch for an automobile anti-theft device

A rotary electrical switch comprising an upper rotor mounted free to rotate about an axis of rotation with respect to a lower stator, the rotor being rotatable between first and second angular positions, the second angular position being connectable to a power supply by at least one electrical strip contact having a fixed axially aligned contact element supported by the stator and a hairpin shaped contact strip that lies within an axial plane and that comprises a fixed axially aligned segment supported by the stator and a mobile axially aligned segment that is generally parallel to the first fixed segment and that is connected to the first fixed segment through an upper intermediate segment in the shape of the arc of a circle, the mobile segment having a free end that is capable of cooperating or not cooperating with a portion facing a contact of the fixed contact element depending on the relative angular position of the rotor and the stator,

• wherein the rotor includes a cam surface to clean the contact by cooperating with a radially external portion facing the intermediate segment of the contact strip to elastically deform the contact strip globally in a median axial plane, causing relative displacement of the free end of the mobile segment with respect to the contact portion of the fixed contact element with which the mobile segment is in contact, when the rotor closes or opens the contact.