Why are they used?

The varistor is a surge protection device that is connected directly across the AC input. When a power surge or voltage spike is sensed, the varistor's resistance rapidly decreases, creating an instant shunt path for the over-voltage, thereby saving the sensitive control panel components.

Applications / How do you spot opportunities?

Cellular phones, data transmission lines, LANs, modems, etc

How to ask for opportunities?

Do you need any device to control the abrupt voltage fluctuations of a circuit?

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