Outpatient surgery

When electrical and electronic equipment is subjected to abnormal voltage due to a surge generated externally. There are two causes: a switching surge generated in the AC power circuit on the power supply side that enters through the power line, and a lightning surge generated by a lightning strike that enters through the ground. An effective countermeasure against external surges is the installation of a varistor. A varistor has high insulation resistance under normal voltage, but when a certain level of high voltage is exceeded, its resistance decreases, allowing it to divert the surge voltage and protect the equipment.

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