They have low resistances, normally inside the tens to loads of milliohms (mΩ), and fast trip instances that are beneath 5 s. PPTC fuses come in 0402 surface mount applications to limit space in small portable devices. Instead of an MOV, a TVS diode for overvoltage safety of the DC circuitry must be taken into consideration. A TVS Zener diode offers circuit protection from ±30 kV of massive thru-the-air or direct touch ESD strikes. Also, the TVS diode can adequately soak up as much as 80 A from a lightning strike.
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