Zero line protection circuit and residual current circuit breaker
The utility model discloses a null line protection circuit and a residual current circuit breaker, the null line protection circuit comprises a null line detection unit, the null line detection unit is connected with a null line inlet end of the residual current circuit breaker through a tripping un...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The utility model discloses a null line protection circuit and a residual current circuit breaker, the null line protection circuit comprises a null line detection unit, the null line detection unit is connected with a null line inlet end of the residual current circuit breaker through a tripping unit, and the null line detection unit is connected with an electric leakage detection unit; the zero line detection unit is used for outputting a voltage monitoring signal to the electric leakage detection unit; the electric leakage detection unit is used for judging whether to output a zero line protection driving signal to the tripping unit or not according to the voltage monitoring signal; the tripping unit is configured to be tripped in response to a zero line protection driving signal. According to the invention, when the zero line of the power supply output end is not correctly connected to the zero line inlet end, the tripping unit is tripped in time, the connection between the residual current circuit breake |
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