Improved overheat overvoltage protection machine

Abstract

Disclosed over-heat over-voltage protective device, comprises a housing, at least a voltage-sensitive resistor, at least a top pin and a low pin. It is characterized in that: a heat release unit is amounted between said voltage-sensitive resistor and the top pin, which is also on the surface of one electrode of said voltage-sensitive resistor; a deterioration indicating pin is extended from said voltage-sensitive resistor; said housing is filled with epoxide resin to form a whole mold. The voltage-sensitive resistor is in the cascade connection with the heat release unit while the release point extends from the center of voltage-sensitive surface to make the voltage-sensitive resistor which is deteriorated release from the electrified wire netting automatically and reliably, for avoiding the short circuit between electrodes and improving the protective function; the voltage-sensitive resistor and the heat release unit are contained in one housing, which utilizes the surge absorbing function of voltage-sensitive resistor and the inner operation of heat protective release unit to concentrate the heating points, shorten the heat transmission distance, and confirm the fast, reliable release between the deteriorated voltage-sensitive resistor and the electrified wire netting.

Description

technical field [0001] The invention relates to a power protector, in particular to an overheat and overvoltage protector for power surge protection. Background technique [0002] In order to prevent surge damage to equipment and instruments, varistors with good surge suppression effects and other external overcurrent or overheat protection devices are generally connected in parallel at the input end of the power supply. As the use time increases, the leakage current of the varistor will gradually increase, which will lead to a gradual increase in the internal temperature, and as the temperature of the varistor increases, the leakage current will increase again, resulting in a voltage At the same time, the piezoresistor often shows a short circuit state after it is degraded by a large current impact. Both of these situations will bring great harm to the power supply system and electrical equipment. In the current application method and market (lightning protection devices ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned patents have the function of lightning protection, it is difficult to solve the matching between the overcurrent and thermal protection parameters and the lightning surge flow rate. At the same time, when the varistor is damaged due to deterioration, it cannot be removed from the circuit quickly and effectively, which is very easy. short circuit between poles

Bring great harm to the power supply system and electrical equipment

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