The best replacement for varistor is tvs.

The best alternatives to varistor are rated as following:
★★★★★  tvs
★★★★  zener
★★★  thermistor
★★★  transorb
★★  transient voltage suppressor
★★  capacitor
★  transil
  ceramic capacitor
  tvs diode
  thyristor

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varistor
tvs
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