Abstract: The present disclosure relates to an arc detection device comprising: a high frequency signal detection unit for detecting a high frequency signal from a current flowing through a power line; a signal strength detection unit for detecting the strength of the detected high frequency signal; a voltage detection unit for detecting a change in the voltage of the power line; and a control unit for detecting zero crossing points, which are time points having a reference voltage according to phase alternation of the voltage from the change in voltage, detecting a preset number of peaks from changes in the strength of the high frequency signal detected at intervals between the detected zero crossing points, and determining whether arcs occur in the intervals by comparing signal strength values of the detected preset number of peaks to a preset reference value.

Abstract: An earth leakage circuit breaker and a method of controlling the same are disclosed. An earth leakage circuit breaker according to the present disclosure can detect a type of leakage current and output the type of the leakage current in various forms such that a user can recognize the type of the leakage current. Therefore, the user can easily recognize whether or not the leakage current has occurred and the type of the leakage current. This may facilitate the user to recognize the cause of the leakage and take an effective measure for preventing an accident.

Abstract: An earth leakage circuit breaker and a method of controlling the same are disclosed. An earth leakage circuit breaker according to the present disclosure can detect a type of leakage current and output the type of the leakage current in various forms such that a user can recognize the type of the leakage current. Therefore, the user can easily recognize whether or not the leakage current has occurred and the type of the leakage current. This may facilitate the user to recognize the cause of the leakage and take an effective measure for preventing an accident.