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How to check a relay, what faults there are, whether these faults can be eliminated and how they can be eliminated. Why a relay can constantly buzz, what the contact group is made of, why technical silver is there. In general, everything about an electromechanical relay, how to work with it, how it works, and many nuances regarding the normal operation of the relay. It also tells about the voltage and resistance of the relay coils. Cleaning the relay coils - where does the carbon come from?