Piezoresistor with self-checking function and surge protector thereof

A varistor and functional technology, applied in varistors, overvoltage protection resistors, resistors, etc., can solve the problems of surge protector damage, incomplete detachment, and easy fire, so as to ensure normal use, The effect of overcoming the defect of fault indication and improving the safety of use
CN110233012APending Publication Date: 2019-09-13SICHUAN WEIYU ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
SICHUAN WEIYU ELECTRIC CO LTD
Publication Date
2019-09-13

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Abstract

The invention relates to the technical field of protective electric appliances, in particular to a piezoresistor with a self-checking function and a surge protector thereof. The piezoresistor with theself-checking function comprises a piezoresistor body and at least one color-changing body, wherein a color-changing body is in heat conduction connection with the piezoresistor body, the color-changing body changes color by sensing a temperature and marks the temperature condition of the piezoresistor body, so that when the temperature of the piezoresistor changes, the color of the color-changing body changes, so that the self-checking function of the piezoresistor is achieved, and workers can determine the thermal damage condition of the piezoresistor according to the color change conditionof the color-changing body, it is achieved that the piezoresistor is replaced in time after thermal damage and the normal use of the surge protector with the piezoresistor with the self-checking function is guaranteed, a circuit is cut off in time, the temperature control protection effect is achieved, the defect that fault indication is achieved mechanically in the prior art is overcome, the fault rate is lower, and the use safety of the surge protector is improved.
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Description

technical field

[0001] The invention relates to the technical field of protective electrical appliances, in particular to a varistor with a self-check function and a surge protector thereof. Background technique

[0002] Varistor is a resistive device with nonlinear volt-ampere characteristics. It is often used as an overvoltage protection device. When the varistor is subjected to overvoltage energy, its temperature continues to rise, and when it reaches the withstand limit of the varistor, the voltage The sensitive resistor has a thermal damage failure and needs to be replaced before it can continue to play a protective role.

[0003] However, the existing varistor itself cannot display the thermal damage condition, so that after the varistor is thermally damaged, the user cannot find and replace the varistor in time, which affects the protection of sensitive devices using the varistor.

[0004] Existing surge protectors are generally equipped with piezoresistors, and the ...

Claims

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