What's a PTC device? The acronym stands for "positive temperature coefficient".

PTC (positive temperature coefficient) is just about the tempco, the opposite of NTC. PTC resettable fuses/polyswitches/polyfuses do have a positive tempco, but the resistance sharply increases above a certain temperature. At that temperature something inside melts, and they trip (though a small amount of current keeps flowing). After they're tripped, they'll be slower to trip next time. There are also PTC thermistors designed as temperature sensors, these have a linear(ish) resistance versus temperature curve, and don't change when exceeding a certain temperature. These can survive much more heating/cooling cycles. Regular resistors can also be classified into NTC and PTC (eg. carbon film versus metal film).

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