of the casing 1 with reference now to fig8 a to 8e the switch device according to the present invention can be seen at the time when the user is moving the control of the cooking heating equipment in the direction of return to the turned off position i e the rotary core 2 of the switch device is rotating in the opposite direction from that stated above with reference to fig7 a to 7e in this case it is noted that the rotary core 2 together with the commutator ring 3 is in the position in which the cam 12 is out of alignment in relation to the free segment of the contact blade l and consequently as said commutator ring 3 is rotated the cam 12 thereof does not make contact with said free segment of the blade l and therefore a blade is not pushed aside toward the other contact blade with particular reference to fig8 d and 8e it is noted that in this condition of return of the control to the turned off position the projecting portion 5 a of the lower structural body 1 a interacts with the lower protuberant portion 11 u2032 of the commutator ring 3 such that said guide 10 of the ring 3 is arranged in the upper region of the rail 9 of the rotary.