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PTC thermistors come in a couple of distinct flavors; a linear variety used for sensing purposes and a non-linear variety used for temperature/current limiting. The PTC thermistor product family would be a likely place to look, however.
There are also PTC fuse products, which serve similar though different purposes.
Defining the specific application, its requirements, and desired electrical behavior of the component in question would be important to identifying a suitable product.
