Definition of "varistor" []

• An electronic component having a variable resistance; used to protect circuits against power surges. (noun)

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• "Also, most blue boxes use telephone earpieces (with the varistor removed) for speakers."
• "As a result, an additional varistor for ESD suppression is no longer needed. blog comments powered by Disqus"
• "There are three stages of surge and spike protection in the form of a GDT (gas discharge tube), MOV (metal oxide varistor) and TVS (transient voltage suppression diode)."