Circuit breaker

Abstract

A circuit breaker comprises a shell, and a circuit breaker phase electrode and an electric leakage protection electrode which are arranged on two sides of the shell side by side. The circuit breaker is characterized in that the electric leakage protection electrode comprises a zero sequence current transformer, an electric leakage operation mechanism, an electric leakage test mechanism, a neutralpole static contact and a neutral pole moving contact which are oppositely arranged in the shell; the circuit breaker phase pole comprises a phase pole operating mechanism, a static contact and a moving contact which are oppositely arranged, wherein the moving contact is connected with the phase pole operating mechanism; the main loop of the phase pole of the circuit breaker passes through the zero sequence current transformer; the test mechanism forms a test loop with double breakpoints through two contacts of a first contact part and a second contact part on the elastic part; moreover, the first contact part is driven by the neutral line driving part connected with the neutral pole moving contact to be contacted with the first contact part, and the neutral line driving part is connectedwith the phase pole operating mechanism or the electric leakage operating mechanism, so the test button can be pressed down to disconnect the test loop when the phase pole of the circuit breaker is switched off, and the reliability of the circuit breaker is improved.

Description

technical field [0001] The invention relates to the field of low-voltage electrical appliances, in particular to a circuit breaker. Background technique [0002] The test mechanism of the circuit breaker is limited by the space of the housing. The test circuit of the test mechanism usually adopts a single break point structure. There is a voltage to the ground due to conduction, which may cause the risk of electric shock during use, and does not meet the safety regulations of specific areas. One of the breakpoints is controlled by the handle, and the test circuit will be turned on when the test button is pressed when the handle is closed, but the breakpoint conduction and disconnection speeds are affected by the closing and opening speeds of the handle. The problem of reset will cause the breakpoint to disconnect slowly. At this time, if the circuit breaker is reversed, pressing the test button will cause the test circuit to disconnect slowly, causing the coil of the circui...

AI Technical Summary

Problems solved by technology

[0002] The test mechanism of the circuit breaker is limited by the space of the housing. The test circuit of the test mechanism usually adopts a single break point structure. There is a voltage to the ground due to conduction, which may cause the risk of electric shock during use, and does not meet the safety regulations of specific areas. One of the breakpoints is controlled by the handle, and the test circuit will be turned on when the test button is pressed when the handle is closed, but the breakpoint conduction and disconnection speeds are affected by the closing and opening speeds of the handle. The problem of reset will cause the breakpoint to disconnect slowly. At this time, if the circuit breaker is reversed, pressing the test button will cause the test circuit to disconnect slowly, causing the coil of the circuit breaker to heat up and burn, and the problem of circuit breaker failure is serious. Affect the reliability of the circuit breaker

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