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A Varistor is a device that is capable of resistive conduction once a specifice voltage is reached. Its purpose would be to reduce the electrical noise that a dc motor may induce on to the power supply.
Typical varistor application is to put them after fuse, so if voltage is over varistor's target voltage, varistor's resistance drop down and fuse blow up, so rest of circuit is saved of overvoltage. Every varistor can apsorbe certain amount of energy and after that he's blow up himself (if used fuse is too strong).
Hello nicleo,
Varistors are voltage-dependant resistors. As resistors, they can be used in AC or DC. Just be sure to use a varistor with a voltage spec above the PEAK value of your AC line.
Best regards.
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