Can't Tell the Difference Between Air Switch and Leakage Switch? The Following Will Let You Understand
How To Judge Whether There Is Leakage？
Basis for judging leakage
The principal basis for judging whether there is leakage is that the current flowing into and out of the switch must be equal, otherwise, it is determined as leakage. When the leakage current reaches and exceeds a certain level, a protection action - tripping occurs. The decision threshold can be set, because the circuit is designed by us. It is just that protectors with different sensitivities should be selected according to different occasions.
If it is used for personal safety protection, if the leakage current is less than 30mA, it is regarded as safe; if it is greater than 30mA, it is regarded as unsafe, and a protection action will occur. The leakage protector or protection switch with a rated current of 30mA for leakage protection belongs to the same sensitivity leakage protector or protection switch. Its production protection action time should also be within 0.1 seconds. The selection of these two parameters is mainly based on:
30mA：
The perceived current of the human body----1.1mA for males and 0.7mA for females. Get rid of the current 16mA for males and 10.5mA for females. When the current reaches 50mA, it will cause ventricular fibrillation, which is life-threatening, while the current above 100mA will cause death in the center, and below 30mA will not be life-threatening for the time being.
0.1s：
The human heart has an interval of 0.1 seconds for each contraction and expansion, and within this 0.1 second, the heart is most sensitive to current. If the current passes through the heart at this moment, even if the current is small, it will cause the heart to quiver and be dangerous.
But it must be noted that the usual leakage protection switches or leakage protector is only suitable for power frequency power supply. It is not applicable to other power supplies, such as DC power supply and high frequency power supply and must not be used indiscriminately.
