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The varistor is two terminal device. The varistor, like the diode, is sensitive to the voltage across it. However, the varistor is designed to conduct at a specified forward and reverse biased voltage.

Ideally, it acts like an open if the voltage across the varistor is less than the specification voltage. If the varistor voltage is exceeded with either polarity, it turns on and holds its rated voltage across itself and any connected component.

The schematic symbol of Figure (a) reflects the diode nature of the device. The two opposing diodes reflect that the device is designed to turn on in both directions as shown by its schematic symbol and by its characteristic curve of Figure (b). This figure shows this varistor turning on when its voltage drop exceeds 100 V in either direction. If its voltage drop is less than 100 V, the varistor is off and acts like an open.

Typically a varistor is placed across another electrical component to protect it from excessive voltage drops. If the voltage drop across the varistor is less than the specified voltage, the varistor acts like an open and plays no part in the circuit. If the voltage drop across the varistor exceeds its specification, then the varistor turns on and maintains a fixed voltage drop. In the example of Figure (b), if the varistor turns on, the voltage across it and its companion component is limited to 100 V. Thus the voltage drop across the component placed across the varistor could not exceed 100 V.

10k201 Varistor
Rs.25.0
10k201 Varistor..
10k220 Varistor
Rs.25.0
10k220 Varistor..
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10k471 Varistor..
10nM 1kV Varistor
10nM 1kV Varistor..
7k230 Varistor
Rs.25.0
7k230 Varistor..
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GC-C104 Varistor..
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Rs.25.0
S14k20 Varistor..
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Rs.25.0
14D200 Varistor..
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Rs.25.0
TTC202 Varistor..
Out of stock
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7k221 Varistor..
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Rs.25.0
VDR022 Varistor..
VDR052 Varistor
Rs.25.0
VDR052 Varistor..
7k82 Varistor
Rs.25.0
7k82 Varistor..
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Rs.25.0
9G220 Varistor..
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Rs.25.0
SVC121 Varistor..
14k221 Varistor
Rs.25.0
14k221 Varistor..
10D471K Varistor
10D471K Varistor ..
Out of stock
20D471K Varistor
20D471K Varistor MAX AC: 300 MAX DC: 385 Varistor Voltage: 470(423~517)..
20D681K Varistor
20D681K Varistor MAX AC: 420 MAX DC: 560 Varistor Voltage: 680(612~748) ..
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20k241 Varistor..
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Rs.25.0
20k50 Varistor..
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275L40B 140J 275VAC 20MM Varistor
275L40B Varistor ..
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Rs.40.0
2504 Varistor..
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7N201K Varistor..
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7N301K Varistor..
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Rs.40.0
7N391K Varistor..
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Rs.40.0
7N471K Varistor..
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Rs.30.0
7N820K Varistor..
SVC561 Varistor
Rs.35.0
SVC561 Varistor ..
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