Activation mechanism for switch devices

A switch device comprising:

• a casing having a path defined therein and a protrusion surrounded by the path, a first terminal and a second terminal each having an end located in the casing and the other end extending from a bottom of the casing, the terminals having a first contact point on the end thereof in the casing;
• a push member movably engaged on a top of the casing and two positioning springs biased between the push member and the casing, a guide pin pivotably connected to the push member and having an insertion which is movably engaged with the path in the casing;
• a bimetallic plate having an end connected to the first terminal and including a free section, a second contact point connected to the free section and located above the first contact point, and
• a driving plate rotatably connected to the casing and including a polygonal aperture through which the insertion of the guide pin and the protrusion extend, the polygonal aperture including a first recess, a second recess and a third recess, the switch device is in OFF status when the insertion of the guide pin engaged with the first recess, the switch device is in ON status when the insertion of the guide pin engaged with the second recess, the second recess allowing the insertion of the guide pin not to impede rotation of the driving plate in overload, a hook portion extending from the driving plate and holding a free end of the bimetallic plate.