Shaped Shell Excitation AuxiliaryThe manufacturer believes that the full name of the leakage protector is the residual current action protector, which is mainly composed of three parts: detection element, intermediate amplification link and operation actuator. When leakage occurs, abnormal current and voltage signals will appear. The leakage protection device detects this abnormal current or voltage signal, and through signal processing, prompts the actuator to act, and quickly cuts off the power supply through the switch device to implement leakage protection.

Plastic shell excitation auxiliary manufacturers believe that the leakage protector needs to act according to the leakage current, so it has three unique parameters:

1. rated leakage current under the specified conditions, the leakage protector action current value. For example, a 30mA protector, when the current value reaches 30mA, the protector acts to cut off the power supply.

2. The plastic shell excitation auxiliary manufacturer believes that the rated leakage action time refers to the time from the sudden application of the rated leakage action current to the time when the protection circuit is cut off. For example, for a 30mA0.1s protector, the time from the current value 30mA to the separation of the main contacts is less than 0.1s.

3. The plastic shell excitation auxiliary manufacturer believes that under the specified conditions, the rated leakage non-activation current, that is, the current value of the leakage protector non-activation, should generally be half of the leakage activation current value. For example, leakage current 30mA leakage protector, when the current value is lower than 15mA do not operate, otherwise it is easy to malfunction due to high sensitivity, affecting the normal operation of electrical equipment.

　　Shaped Shell Excitation AuxiliaryThe manufacturer believes that the leakage protector is equipped with a zero-sequence transformer to monitor the current of the live wire and the zero wire at any time. Under normal circumstances, when the current flows from the live wire to the zero wire, the currents of the two wires should be equal, and the magnetic fields induced on the zero sequence transformer are the same in magnitude and opposite in direction, canceling each other out.

When leakage occurs, part of the current flows into the earth, causing the live current to be greater than the zero line, and the magnetic field in the zero sequence transformer is no longer balanced. A voltage is then induced in the secondary winding, triggering the internal thyristor. After the thyristor is turned on, the power supply of the electromagnetic release is turned on, so that the release will automatically trip immediately and cut off the power supply. This is why the leakage protector can prevent electric shock, because the power supply can be cut off within 0.1 seconds after leakage, so it can ensure safety.

　Shaped Shell Excitation AuxiliaryThe manufacturer believes that when the human body contacts the charged body and the current flows through the human body, it is called an electric shock. According to the cause of electric shock, it can be divided into direct electric shock and indirect electric shock. Direct electric shock refers to the electric shock caused by the human body directly contacting the charged body (such as the contact phase line). Indirect electric shock refers to electric shock caused by human contact with metal conductors that are not charged under normal circumstances and charged under fault conditions (such as contact with the shell of leakage equipment). According to the different causes of electric shock, electric shock prevention measures are divided into direct contact protection and indirect contact protection. Direct contact protection can generally use insulation, shielding, fence, safety distance and other measures; indirect contact protection can generally use protective grounding (zero), protection cut-off, leakage protection and other measures.