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NEWLIFE ring varistors and general varistors are mainly used for overvoltage protection and circuit protection of electronic products. Various electronic circuits and equipment are often affected by operating overvoltage in practical applications. The so-called operating overvoltage is the suppressed overvoltage generated when the working state of the circuit changes suddenly, the electromagnetic energy is transformed rapidly and the electric energy is transmitted rapidly. In order to prevent this kind of overvoltage, high-energy ZnO varistors can be used to protect various large power equipment, large electromagnets and large motors; while for automotive circuits, communication lines and many civilian electrical circuits, low-voltage ZnO varistors or other types can be used. The low voltage varistor is protected.