Residual Current Devices (RCD) measure the difference of intensity of the current between the phase and neutral conductors. If some leakage current flows through the human body, the RCD trips within a few milliseconds, preventing injuries. But you need the right type of RCD, depending on the different types of applications.
Learn the difference and when to use all the different types: Type AC, Type A, Type A-SI, Type F and Type B-SI.
[ Ссылка ]
