A varistor with dual temperature safety and a preparation method thereof

The invention discloses a dual-temperature safety varistor, comprising a varistor body, a flame-retardant housing, a positioning card and a flame-retardant filling material, wherein the varistor bodycomprises a zinc oxide-based varistor valve plate, a tin-plated copper plate, a series temperature fuse, a bypass fuse, a lead, etc. The varistor body is arranged in a flame-retardant shell; Install the positioning card and fill the flame retardant filling material; The tin-plated copper sheet is fixed on the silver electrode of the zinc oxide-based varistor sheet by hot air reflow soldering of the tin foil; Energy storage spot-welding lead, series temperature fuse; AB glue securing bypass fuse. Through the series temperature fuse on the varistor valve plate, the series temperature fuse is fused when the varistor deteriorates the temperature rise or meets the abnormal large current, which causes the varistor to open the circuit, cuts off the power supply, that is, the fire source, and extinguishes the flame in the