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How does a resettable fuse work?

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How does a resettable fuse work?

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PPTC resettable fuses are designed and made of patented Polymeric PTC (PPTC) material in thin chip form. ... Upon fault current being removed, the resettable fuse cools and its resistance drops to the original extremely low value. The resettable fuse is \u201creset\u201d and allows the current through the circuit again.

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