Surge absorber

A surge absorber comprising:

• a hollow insulator having a top and a lower opening at a top and a lower portion thereof, respectively;
• a top electrical terminal at said top portion and hermetically sealing said top opening;
• a metal oxide varistor positioned in said hollow insulator and having a top and a bottom electrode at the top and bottom surfaces thereof, respectively, the top electrode being electrically connected to said top electrical terminal;
• and
• a sealing means sealing the lower opening of said hollow insulator and comprised of a lower electrical terminal and a conductive rod electrically connected to ground, the bottom end of which is a free end and the top end of which is soldered to said lower electrical terminal by a solder, said metal oxide varistor being supported by said top and lower portions of said insulator through said top and lower electrical terminals, respectively, and said conductive rod being thermally connected to said metal oxide varistor through said bottom electrode of said metal oxide varistor and said lower electrical terminal, whereby when said metal oxide varistor is heated by an electric current therethrough to a temperature to heat said solder above the melting point of said solder, said conductive rod is separated from said lower electrical terminal to fall downwardly, thereby stopping the electrical current through said metal oxide varistor to ground.