Abstract: Disclosed is a power off device which includes a micro arc detector for turning on a first switching element, based on a voltage induced in a high frequency choke coil by a high frequency pulse current caused by micro arc at a power line, a high current arc detector for outputting a high current arc detection current during turning-on of a second switching element made based on variation of a magnetic field generated at a coil, a delay unit for accumulatively charging the micro arc detection current or the high current arc detection current in a delay capacitor at a predetermined time constant, a power off unit for electrically disconnecting a load from the power line when an operating voltage is applied, and a first switch for connecting the operating voltage to the power off unit in response to the arc detection signal.

Abstract: Disclosed is a power off device which includes a micro arc detector for turning on a first switching element, based on a voltage induced in a high frequency choke coil by a high frequency pulse current caused by micro arc at a power line, a high current arc detector for outputting a high current arc detection current during turning-on of a second switching element made based on variation of a magnetic field generated at a coil, a delay unit for accumulatively charging the micro arc detection current or the high current arc detection current in a delay capacitor at a predetermined time constant, a power off unit for electrically disconnecting a load from the power line when an operating voltage is applied, and a first switch for connecting the operating voltage to the power off unit in response to the arc detection signal.

Abstract: The present invention provides a power cutoff device automatically operated upon the occurrence of a spark on an electric wire. The power cutoff device of the present invention automatically cuts off power supply to an earth leakage breaker or an electronic switch according to a control signal transmitted by detecting an electromagnetic wave due to an electric spark generated on an electric wire by an abnormal state such as a connection failure of an electrical device, thus preventing a disaster such as an electrical fire caused by the electric spark (flame). According to the present invention, since the power cutoff device provides an intrinsic function of the earth leakage breaker that operates in a state of an overload or electric leakage and the earth leakage breaker is operated by detecting the electric spark generated on the electric wire, it is possible to effectively prevent a disaster such as an electrical fire caused by the electric spark.

Abstract: The present invention provides a power cutoff device automatically operated upon the occurrence of a spark on an electric wire. The power cutoff device of the present invention automatically cuts off power supply to an earth leakage breaker or an electronic switch according to a control signal transmitted by detecting an electromagnetic wave due to an electric spark generated on an electric wire by an abnormal state such as a connection failure of an electrical device, thus preventing a disaster such as an electrical fire caused by the electric spark (flame). According to the present invention, since the power cutoff device provides an intrinsic function of the earth leakage breaker that operates in a state of an overload or electric leakage and the earth leakage breaker is operated by detecting the electric spark generated on the electric wire, it is possible to effectively prevent a disaster such as an electrical fire caused by the electric spark.