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these are mov most of the time, they must be used with a fuse before or they will explode if overvoltage occurs
https://en.wikipedia.org/wiki/Varistor
Are there fuses that protect from higher voltages instead of higher currents?
I think that it's better for me to specify: I need it little (max 1cm x 1cm x 0.5cm) and for low voltages/currents (5V - 2A must pass, 7V - 2A must not pass). What's best with this requisites?