Leakage current detection interrupter with fire protection means

A leakage current detection interrupter with fire protection means, comprising:

• (i) a line phase terminal, a line neutral terminal, a line ground terminal, a fire protection terminal, a first output, a line second output and a third output, wherein the line phase terminal, the line neutral terminal, and the line ground terminal are connectable to a source of electricity, and the first output, the second output and the third output are connectable to at least one user accessible load;
• (ii) a leakage current protection circuit having:
• a first switch having a first terminal and a second terminal respectfully connected to the line phase terminal and the first output, an opening position in which the line phase terminal is disconnected to the first output, and a closing position in which the line phase terminal is connected to the first output;
• a second switch having a first terminal and a second terminal respectfully connected to the line neutral terminal and the second output, an opening position in which the line neutral terminal is disconnected to the second output, and a closing position in which the line neutral terminal is connected to the second output;
• an trip coil having a first terminal connected to the first terminal of the first switch and a second terminal coupled to the first terminal of the second switch, configured such that when being activated, the trip coil causes the first switch and the second switch to be in the opening position simultaneously;
• an inductive coil having a first terminal and a second terminal, coupled to the first output and the second output for sensing a current difference in the line from the line phase terminal to the first output and the line from the line neutral terminal to the second output;
• and
• a leakage current detection circuit having a first input terminal and a second input terminal respectively connected to the first terminal and the second terminal of the inductive coil, a first output terminal connected to the second terminal of the trip coil and a second output terminal connected to the first terminal of the second switch, configured such that when a fault conduction is detected through the inductive coil, the leakage current detection circuit responsively outputs a current to activate the trip coil, thereby causing the first switch and the second switch to be in the opening position simultaneously, wherein the fault conduction is corresponding to the current difference sensed by the inductive coil larger than a predetermined value;
• (iii) an electrical cord having:
• a phase wire, a neutral wire, a ground wire, an insulation film covering the phase wire, the neutral wire and the ground wire, and a metallic shield covering the insulation film, wherein the phase wire, the neutral wire and the ground wire are respectively connected between the first output, the second output and the third output, and the at least one user accessible load, and the metallic shield is connected to the fire protection terminal;
• (iv) a fire protection circuit having;
• a pair of rectifying diodes, each rectifying diode having an anode and a cathode, wherein the anodes of the pair of rectifying diodes are respectively connected to the line phase terminal and the line neutral terminal;
• and
• a resistor having a first terminal connected to the cathodes of the pair of rectifying diodes and a second terminal connected to the fire protection terminal,
• wherein when a fire hazard occurs, it causes the insulation film of the electrical cord to melt down so that the metallic shield is contact with one of the core the phase wire, the neutral wire and the ground wire of the electrical cord, which in turn, detours a current from the fire protection terminal through the fire protection circuit, thereby causing the current difference in the line from the line phase terminal to the first output and the line from the line neutral terminal to the second output, which results in the first switch and the second switch in the opening positions;
• and
• (v) an indicator circuit having:
• a diode having an anode connected to the fire protection terminal, and a cathode;
• a resistor having a first terminal connected to the cathode of the diode, and a second terminal;
• and
• a light emitting diode (LED) having an anode connected to a second terminal of the resistor and a cathode connected to the second output,
• wherein the LED lights up in a normal working condition in which the first switch and the second switch are in the closing position, and the LED is not lit in a fault condition in which the first switch and the second switch are in the opening position.