PTC Resettable Fuses

A PTC resettable fuse is a polymeric positive temperature coefficient (PPTC) device used to protect against overcurrent faults in electronic circuits. When overcurrent conditions occur, the Polymeric PTC material heats up and its resistance increase sharply and such a sharp resistance increase cuts off the current in the circuit. Upon fault current being removed, the resettable fuse cools and its resistance drops to the original extremely low value.

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