Barrel-shaped fireproof and explosion-proof surge protection device with over-temperature protection function

A barrel-shaped fireproof and explosion-proof surge protection device with the function of over-temperature protection, characterized by comprising:

• a barrel-shaped housing, a barrel-shaped varistor and a cylindrical temperature protector, wherein the barrel-shaped housing houses the outer wall of the barrel-shaped varistor, the barrel-shaped varistor comprises a barrel-shaped varistor chip, an outer electrode arranged on the outer circular wall and outer top of the barrel-shaped varistor chip, and an inner electrode arranged on the inner circular wall and inner top of the barrel-shaped varistor chip, wherein the outer electrode is connected with an outer pin while the inner electrode is connected with an inner pin;
• the cylindrical temperature protector is arranged in the barrel space of the barrel-shaped varistor and is provided with two leading foots which are led out independently, or one of which is connected with the inner electrode of the barrel-shaped varistor and is led out, or one of which is connected with the inner electrode of the barrel-shaped varistor but is not led out, whereby forming barrel-shaped fireproof and explosion-proof surge protection devices having the function of over-temperature protection with different forms of circuits.