Temperature protection type leakage protection circuit breaker

Abstract

The invention relates to a temperature protection type electric leakage protection circuit breaker, which comprises a power supply circuit, a test circuit, a detection chip, a driving circuit and an over-temperature judgment circuit, and is characterized in that the test circuit is used for outputting a voltage signal; the detection chip is connected with the power supply circuit and the test circuit and used for receiving the voltage signal and generating a control signal according to the voltage signal; the driving circuit is connected with the detection chip and is used for receiving the control signal and driving the release to act according to the control signal; the over-temperature judgment circuit is used for detecting contact temperature information, the over-temperature judgment circuit is connected with the test circuit, and when the contact temperature information exceeds a preset threshold range, the over-temperature judgment circuit conducts the test circuit. Therefore, by additionally arranging the over-temperature judgment circuit, the circuit breaker can be disconnected when the temperature of the contact exceeds the preset threshold range, and the temperature protection function of the contact is achieved.

Description

technical field [0001] The present application relates to the technical field of electrical appliances, in particular, to a temperature-protected leakage circuit breaker. Background technique [0002] A circuit breaker is a switching device capable of closing, carrying and breaking current under normal or abnormal circuit conditions. Circuit breakers can be used to protect power lines and motors. When power lines or motors are seriously overloaded, short-circuited, or under-voltage, they can automatically cut off the circuit. Its function is equivalent to a combination of a fuse switch and an overheating relay. Moreover, there is generally no need to change parts after breaking the fault current. [0003] However, the circuit breakers used in power plants in the prior art are prone to contact heating due to poor contact contact, design defects, product manufacturing process, contact corrosion, etc., eventually causing the contacts to deform or even heat up and melt. At thi...

AI Technical Summary

Problems solved by technology

[0003] However, the circuit breakers used in power plants in the prior art are prone to contact heating due to poor contact contact, design defects, product manufacturing process, contact corrosion, etc., eventually causing the contacts to deform or even heat up and melt.

At this time, when the circuit breaker is running at a high current, arcing or burning will occur, and it may even cause an explosion and fire.

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