The first stage leakage protector mcb box plastic covers is installed at the low-voltage side outlet of the distribution transformer. The line of this protection is long, the leakage current is large, the rated leakage current in the absence of perfect multi-level protection, the maximum shall not exceed 100mA; With perfect multi-level protection, the power grid with small leakage current is 75mA in non-rainy season and 200mA in rainy season; The power grid with large leakage current is 100 mA in non-rainy season and 300mA in rainy season. The second level leakage protector is installed at the outlet of the branch line. The protected line is short, the power consumption is not large, and the leakage current is small. The rated leakage action current of the leakage protector should be between the rated leakage action current of the upper and lower protector, generally taking 30mA~ 75MA, such as internal distribution of the distribution box, the total opening of the family line, etc..
The third level leakage protector mcb box plastic covers is used to protect single or multiple electrical equipment, which is directly used to prevent personal electric shock. The power consumption of the protected line and equipment is small, and the leakage current is small, generally not more than 10mA. The leakage protector with rated action current of 30 mA and action time of less than 0.1s should be selected. Bathroom, toilet, kitchen and other humid environment should choose 15mA action current leakage protector.
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