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Varistor’s main function is protection of electronic devices, which have important task in complex industry and
consequently in our lives as well, while EMI suppression components reduce electromagnetic noise below acceptable
What is a varistor?
Varistor is a variable resistor which depends on applied voltage (voltage – dependant resistor) with current – voltage characteristics similar to a diode.
Why use a varistor?
To provide protection in electrical and electronic circuits. Electronic and electrical devices are designed to operate at a certain maximum supply voltage. Considerable damage can be caused by voltage that is higher than that for which the devices are rated.
Voltage across the varistor measured at a
given reference current In
The peak voltage developed across the varistor under standard atmospheric conditions, when passing an 8/20 μs class current pulse.
A peak value of current which is 1/10 of the maximum peak current for 100 pulses, two per minute for the 8/20 μs pulse.