✔✔These resettable fuses are polymeric positive temperature coefficient (PPTC) device, which is used to help protect against harmful overcurrent surges and overtemperature faults.
✔✔Like traditional fuses, these devices limit the flow of dangerously high current during fault conditions.
✔✔However, the fuse resets after the fault is cleared and power to the circuit is removed. The PPTC operates like a resistor. During normal operations it has a resistance of about 0.07 Ohm letting more than enough current flow through. During a fault condition the temperature and resistance of the fuse increases letting much less current through.
✔✔When the fault has been rectified and the fuse cools down the resistance returns to its normal level.
✔✔Widely used in computer, multimedia, industrial equipment, general electronics,com-communications, ect.