Motor vehicle ignition switch and ignition device provided with this ignition switch

A motor vehicle ignition switch comprising a first and a second electric circuit for detecting the angular position of a key in an ignition lock, said first and second circuit comprising respective electrical contacts carried by at least one rotor, which is rotatable about a rotation axis so as to be able to selectively take:

• an off position, wherein said key can be inserted into, or withdrawn from, said ignition lock;
• a starting position;
• a running position, angularly arranged between said off position and said starting position;
• an intermediate position, angularly arranged between said running position and said off position;
• an on position, angularly arranged between said running position and said off position and distinct from said intermediate position;
• said second circuit being independent of said first circuit and defining a resistive divider;
• said first circuit comprising a first, a second and a third conductive laminas, electrically isolated from each other;
• the electrical contacts of said first circuit comprising a first and a second contact, electrically connected to each other;
• said second contact being in contact on said third conductive lamina in the running position and in the starting position and being in contact on said first conductive lamina in the intermediate position.