Circuit breaker

Abstract

The invention provides a circuit breaker, which comprises a phase pole module and a reclosing pole module which are arranged in parallel, wherein the reclosing pole module is used for driving the phase pole module to automatically open and close, the phase pole module is divided into an L-phase pole module and an N-phase pole module by a partition plate, the L-phase pole module comprises an L-pole operating mechanism, an L-pole moving contact of an L-pole contact mechanism is connected to the L-pole operating mechanism, the N-phase pole module comprises an electric leakage protection module, the electric leakage protection module comprises a zero sequence mutual inductor, an electric leakage tripping mechanism, a test button and a residual current action test loop, the residual current action test loop is provided with two on-off points, one on-off point serves as a first on-off point and is controlled to be opened or closed by the test button, the other on-off point serves as a second on-off point and is controlled to be opened or closed by a linkage lever, and when any one of the first on-off point and the second on-off point is opened, the residual current action test loop cannot be switched on. According to the invention, the potential safety hazard caused by long-time pressing of the test button when the circuit breaker is disconnected or reversely connected is avoided.

Description

technical field [0001] The invention relates to a low-voltage electrical appliance, in particular to a circuit breaker. Background technique [0002] Low-voltage circuit breakers, also known as automatic air switches or automatic air circuit breakers, can be used to distribute electrical energy and protect circuits and power supply equipment from overload and open circuits. They can also be used for infrequent line conversion and infrequent motor startup. There is a residual current action test circuit in the existing circuit breaker. This residual current action test circuit usually adopts a single breakpoint structure. , when the user’s power supply is reversed (that is, the outlet terminal is connected to the power supply), the circuit breaker will not close when the power supply voltage is turned on. At this time, if the test button is pressed all the time, it will cause the resistance of the residual current test circuit to burn or the release to burst. This leads to t...

AI Technical Summary

Problems solved by technology

There is a residual current action test circuit in the existing circuit breaker. This residual current action test circuit usually adopts a single breakpoint structure. , when the user’s power supply is reversed (that is, the outlet terminal is connected to the power supply), the circuit breaker will not close when the power supply voltage is turned on. At this time, if the test button is pressed all the time, it will cause the resistance of the residual current test circuit to burn or the release to burst. Causes the leakage protection function of the circuit breaker to fail, posing a safety hazard

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