Small-sized simple switch for protecting circuit

Claim 1

A small-sized simple switch for circuit protection comprises a body; a pressing portion being pivotally connected to the upper portion of said body; at least two wire connecting pads being embedded in the lower face of said body, wherein a first wire connecting pad is provided with a silver contacting point; and a lever with an upper end pivoted to one end of the pressing portion to be pushed or pulled in cooperation with the pressing portion; wherein a second wire connecting pad has an upper portion secured to an alloy plate, the other end of the alloy plate being pivoted to the lever and having a silver contacting point; wherein the alloy plate is highly resilient; and that in normal temperature, by depressing the pressing portion, the alloy plate becomes resiliently bent, causing the silver contacting point to be in or out of contact with the first wire connecting pad and the switch is turned on or off through pushing or pulling the lever, and during overload, the alloy plate expands and becomes deformed only due to its own intrinsic resilient forces, causing the lever to be pushed up and the pressing portion to move to its original position, and the silver contacting point on the first wire connecting pad and the silver contacting point on the alloy plate which are in contact with each other to become disengaged, rendering the switch to be in off condition for circuit protection.