a housing, having a top opening and a side opening, the top opening has a seesaw lampshade, and a first terminal and a second terminal arranged at a bottom section; the first terminal is connected to a binary alloy conductive plate, the binary alloy conductive plate has a spring leaf with a first connecting point, and the second terminal has a second connecting point on a surface of an upper section thereof disposed in correspondence with the first connecting point;

a moving rod linking a pivot hole at a bottom of the seesaw lampshade with one end and the binary alloy conductive plate with an opposing end thereof for the first connecting point to contact the second connecting point responsive to the pivot hole being pushed inward, to thereby achieve a conducting state (ON), and the first connecting point disconnecting from the second connecting point responsive to occurrence of a current overload wherein the binary alloy conductive plate deforms due to high temperature, and thereby achieving a nonconducting state (OFF), to thereby form an overcurrent protection switch; wherein:

the seesaw lampshade is provided with a protruding block at the opposing end corresponding to the pivot hole, the protruding block is formed by extending downward from an outside of the seesaw lampshade, having an inclined pressing surface at an upper part and an inclined against surface at a lower part; and

an elastic leaf arranged above the second terminal and contacting an outside of the protruding block for providing the seesaw lampshade with an elastic stopping force, whereby when switched to an ON position, the elastic leaf is located on the inclined against surface at the lower part of the protruding block; when switched to an OFF position, the elastic leaf is located on the inclined pressing surface of the protruding block, ensuring that the seesaw lampshade and the moving rod are accurately positioned in the housing, thereby pushing a bottom end of the moving rod upward, causing a movable end of the binary alloy conductive plate be pulled upwardly to a highest point and thereby cause the spring leaf to bounce downward, then a distance between the first connecting point and the second connecting point is maximized and not affected by a hairline crack of the binary alloy conductive plate to ensure the safety of an insulation distance between the two connecting points.