Thermal cut-off fuse

A thermal cut-off fuse comprising a housing, first and second lead wires extending from said housing with at least said first lead wire extending into the interior of said housing, a conductive fluid initially in contact in said interior with at least said first lead wire for completing an electrical circuit to said second lead wire, slideable means comprising an electrically insulating barrier means initially disposed at a point remote from said first lead wire, spring means which initially tends to force said slideable means toward said first lead wire and an initially solid pellet positioned so as to restrain said spring means from forcing said slideable means toward said lead wire until a predetermined temperature is reached and said pellet melts, said slideable means being constructed so that upon the melting of said pellet said barrier means is interposed relative to said first lead wire so that any conductive fluid that remains in contact with said first lead wire is completely electrically isolated from the rest of the conductive fluid in said interior of said housing by said barrier means, which breaks the electrical circuit that otherwise would be made between said first and second lead wires through said conductive fluid in the absence of said barrier means.