Leakage protection switch is mainly used to disconnect the circuit in a timely manner in case of equipment leakage fault or fatal personal electric shock. According to the working principle of the protector, it can be divided into three types: voltage type, current type, and pulse type. The voltage type protector is connected between the neutral point of the transformer and the ground. When an electric shock occurs, the neutral point shifts to generate voltage on the ground, in order to cut off the power supply of the protection action. However, because it protects the entire low-voltage network of the distribution transformer and cannot be classified for protection, it has a large power outage range and frequent actions, so it has been eliminated. Pulse current protector is a sudden change in the phase and amplitude of three-phase unbalanced leakage current when an electric shock occurs, which serves as an action signal, but also has a dead zone. The widely used is the current type leakage protector
Function
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