Switch module with a built-in structure of anti-surge and linkage disconnection

A switch module with a built-in structure of anti-surge and linkage disconnection, particularly to one that has an anti-surge instant expanding detaching device with a cocoon form protection structure, comprising:

• a housing having a press button arranged atop thereof, and a first conductive plate, a second conductive plate and a third conductive plate arranged at a lower section thereof;
• said first conductive plate being connected to a binary alloy conductive plate having a first connecting point, and the second conductive plate having a second connecting point on a surface of an upper section thereof corresponding to the first connecting point;
• a moving rod linking up a bottom of the press button with one end of the moving rod and linking up the binary alloy conductive plate with another end of the moving rod so that the first connecting point contacts the second connecting point to turn on the switch module, and for the first connecting point to detach from the second connecting point when current overload occurs and the binary alloy conductive plate is deformed due to high temperature, consequently turning off the switch module;
• characterized in that:
• the anti-surge instant expanding detaching device with the cocoon form protection structure which is built in the housing includes:
• an explosion proof case having an outward opening hole and a containing space therein;
• at least a clad metal oxide varistor that is disposed inside the explosion proof case and has a first conductor wire and a second conductor wire, and the first conductor wire and the second conductor wire extend through the explosion proof case and are electrically connected to the first conductive plate and the third conductive plate;
• an expanded graphite, said expanded graphite wraps up the clad metal oxide varistor and fills up the explosion proof case;
• a pushing element having a cap, at a bottom edge of the cap has a pushing rod that moves linearly along the outward opening hole of the explosion proof case, and at least a part of the cap contacts the expanded graphite;
• whereby when the first connecting point contacts the second connecting point, and when an overvoltage occurs, the clad metal oxide varistor instantly heats up or explodes, and the expanded graphite simultaneously expands linearly and forms the cocoon form protection structure that fills up the containing space like a spider web that covers the clad metal oxide varistor and forms a flame proof layer, the expanded graphite expands as the temperature of the clad metal oxide varistor rises, when an expanding volume of the expanded graphite reaches a predetermined setting, the expanding volume provides a push force to push the pushing element to force the first connecting point to detach from the second connecting point and turn off the switch module.