What is leakage current protection?

Leakage current is the current that flows from the AC or DC circuit in the equipment to the chassis or the ground. In order to avoid direct or indirect contact with leakage or live components by the human body in daily life and during the operation of the equipment, an air switch with a rated residual current circuit breaker (leakage protector) of 30mA is usually designed and installed for personal safety protection.