"leakage protection plug" also known as "residual current protection plug." When electrical leakage, electrical circuits, there must be a part of the current is not flowing back from the firing line after the transformer neutral, but by the ground or the body, such as "conductor" into the earth, constitute the main circuit other than a "tributary" is we usually call "leakage."
When this part of the current through the body into the earth when the person causing an electric shock. "Leakage protection plug" effect is when the plug before the connected appliances, if leakage occurs, the leakage current has not yet reached the amount of current harm to the human body is automatically cut off the power supply to protect the personal safety.
leakage protection plug is detected "ground" loop "residual current." Its working principle is to plug the two power cords (hot and neutral) while penetrating a special "zero-sequence current transformer" center hole, when the normal electrical power, hot and neutral current flowing completely equal , the current one into a current transformer secondary coil no voltage output. When the "ground loop" (including earth loop) in the "residual current" penetration power cord transformer two current imbalance in the "current transformer" will produce the output of a voltage signal proportional to the current , as long as the voltage signal is sufficiently large, the voltage signal by a dedicated integrated circuit board processing such as amplification, the thyristor is triggered to transition from the off board is turned on, so that the circuit in series with the trip coil is energized, so that the main circuit tripping device is disconnected, the protection of personal safety may be in contact with the power supply.
leakage protection plug has a compact, convenient, wide voltage (100-240V), may be appropriate to apply different countries and different places (voltage, leakage current different), according to customer demand using the appropriate plugs, wires, etc., the material is excellent (and more durable) and so on.