vikavirtasuojia
Vikavirtasuojia, known in English as residual current devices (RCDs) or residual current circuit breakers, are protective electrical devices designed to reduce the risk of electric shock and electrical fires. They monitor the current flowing in the live and neutral conductors of a circuit and trip the circuit if a leakage current to earth is detected.
The core principle is differential current sensing. Under normal operation the current entering a circuit equals
RCDs come in several types depending on the waveform of the leakage current they can detect. Type
Important limitations include that RCDs do not protect against overcurrent or short circuits by themselves; they