Polyfuses (PPTC)
A fuse is a one time over current protection device employing fusible link that melts after the current exceeds a certain level for a certain length of time. Typically, a wire or chemical compound breaks the circuit when the current exceeds the rated value.
Polyfuse is a new standard for circuit protection .It is resettable. Technically, Polyfuses are not fuses but polymeric positive temperature coefficient thermistors (PPTC). Re-settable fuses provide over current protection and automatic restoration.
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References for Polyfuses (PPTC)
http://en.wikipedia.org/wiki/Polyfuse http://techon.nikkeibp.co.jp/NEA/archive/200408/322736/
Topic Category - Electrical Topics
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