A semiconductor integrated circuit includes: a first wire through which a signal is transmitted; a second wire that is not used for signal transmission; a switch that creates or breaks an electric connection between the first wire and the second wire; and a control circuit that controls the switch according to an potential of the signal, which is transmitted through the first wire, so that part of charge stored in a first wire capacitor of the first wire moves to a second wire capacitor of the second wire and is stored in the second wire capacitor and the charge stored in the second wire capacitor are drawn to the first wire capacitor to charge the first wire capacitor.

A crowbar device has a first terminal and a second terminal, the terminals being connectible to a medium to high impedance AC voltage source including a trigger circuit configured to output a trigger signal responsive to exceeding a threshold voltage across at least one trigger element of the trigger circuit; a positive-side signaling circuit and a negative-side signaling circuit configured to output a positive or a negative clamping signal, respectively, according to a positive-voltage or a negative-voltage signal, respectively, input from the trigger circuit; and a positive-side overvoltage clamping circuit and a negative-side overvoltage clamping circuit configured to control their respective semiconductor element to be in a conducting state, when the clamping signal from the corresponding signaling circuit is present, and configured to control their semiconductor element to be in a non-conducting state, when the corresponding clamping signal has not been present for a predetermined time period.

A fuseless switch for a cross phase of a power line communication (PLC) network includes a movable contactor, a switch, an electromagnetic tripper, a base and a microcontroller. The microcontroller further includes a low-voltage coupler electrically connected to a first ground line of the first circuit connection terminal and a second ground line of the second circuit connection terminal, so that a network connection signal can cross phases to complete the transmission of information. When a PLC network signal passes through the fuseless switch, the signal proceeds from the low-voltage coupler without being affected or attenuated by the original fuseless switch circuit, so as to overcome the issue of transmitting signals through the power line to other circuits.

A fuseless switch for a cross phase of a power line communication (PLC) network includes a movable contactor, a switch, an electromagnetic tripper, a base and a microcontroller. The microcontroller further includes a low-voltage coupler electrically connected to a first ground line of the first circuit connection terminal and a second ground line of the second circuit connection terminal, so that a network connection signal can cross phases to complete the transmission of information. When a PLC network signal passes through the fuseless switch, the signal proceeds from the low-voltage coupler without being affected or attenuated by the original fuseless switch circuit, so as to overcome the issue of transmitting signals through the power line to other circuits.

A crowbar device has a first terminal and a second terminal, the terminals being connectible to a medium to high impedance AC voltage source including a trigger circuit configured to output a trigger signal responsive to exceeding a threshold voltage across at least one trigger element of the trigger circuit; a positive-side signaling circuit and a negative-side signaling circuit configured to output a positive or a negative clamping signal, respectively, according to a positive-voltage or a negative-voltage signal, respectively, input from the trigger circuit; and a positive-side overvoltage clamping circuit and a negative-side overvoltage clamping circuit configured to control their respective semiconductor element to be in a conducting state, when the clamping signal from the corresponding signaling circuit is present, and configured to control their semiconductor element to be in a non-conducting state, when the corresponding clamping signal has not been present for a predetermined time period.

Provided is a power distribution box distributing commercial electric power supplied from lead-in electric power lines into branch electric power sources and supplying the branch electric power sources to respective loads connected thereto. More particularly, the present invention relates to a power distribution box equipped with a resistive leakage current detector extracting a resistive leakage current simply and accurately from a resultant leakage current and causing leakage current interruption and alarm to be actuated according to the extraction result. The power distribution box equipped with the resistive leakage current detector of the present invention includes: a zero-phase current transformer detecting a resultant leakage current; a voltage detector detecting voltage of branch lines; a power calculator calculating wasted power; a phase difference calculator calculating a phase difference; and a resistive leakage current extractor extracting a resistive leakage current, wherein the power calculator calculates apparent and effective power.

A fuseless switch for a cross phase of a power line communication (PLC) network includes a movable contactor, a switch, an electromagnetic tripper, a base and a microcontroller. The microcontroller further includes a low-voltage coupler electrically connected to a first ground line of the first circuit connection terminal and a second ground line of the second circuit connection terminal, so that a network connection signal can cross phases to complete the transmission of information. When a PLC network signal passes through the fuseless switch, the signal proceeds from the low-voltage coupler without being affected or attenuated by the original fuseless switch circuit, so as to overcome the issue of transmitting signals through the power line to other circuits.

A fuseless switch for a cross phase of a power line communication (PLC) network includes a movable contactor, a switch, an electromagnetic tripper, a base and a microcontroller. The microcontroller further includes a low-voltage coupler electrically connected to a first ground line of the first circuit connection terminal and a second ground line of the second circuit connection terminal, so that a network connection signal can cross phases to complete the transmission of information. When a PLC network signal passes through the fuseless switch, the signal proceeds from the low-voltage coupler without being affected or attenuated by the original fuseless switch circuit, so as to overcome the issue of transmitting signals through the power line to other circuits.

A system is disclosed comprising a DC power supply for supplying DC power to a device having a universal electric motor configured to operate on AC power. The system is configured to have a first authorization component associated with the device and second authorization component associated with the DC power supply so that DC power is supplied to device, or is continued to be supplied to the device, only when the first and second authorization components operatively engage.

Provided is a power distribution box distributing commercial electric power supplied from lead-in electric power lines into branch electric power sources and supplying the branch electric power sources to respective loads connected thereto. More particularly, the present invention relates to a power distribution box equipped with a resistive leakage current detector extracting a resistive leakage current simply and accurately from a resultant leakage current and causing leakage current interruption and alarm to be actuated according to the extraction result. The power distribution box equipped with the resistive leakage current detector of the present invention includes: a zero-phase current transformer detecting a resultant leakage current; a voltage detector detecting voltage of branch lines; a power calculator calculating wasted power; a phase difference calculator calculating a phase difference; and a resistive leakage current extractor extracting a resistive leakage current, wherein the power calculator calculates apparent and effective power.