Self recovery fuse is composed of organic polymer in high pressure, high temperature, curing conditions, mixed conductive particle material, after special processing and. Under normal temperature, normal working current through the internal self recovery fuse, polymer and conductive particle materials of high density together to form crystalline structure, the self recovery fuse in the molecular state of low resistance, PTC resistance in normal 10m between Omega Omega --5. When the self recovery fuse ends of short circuit / destructive current, self recovery fuse power consumption P= "I" 2R began to increase in tandem, self recovery fuse instantly generate a lot of heat, the self recovery fuse inside the polymer temperature rises rapidly, resulting in the rapid expansion, and began to crystallize colloid particle, conductive molecule health began to break, blocking the pathway formed by conductive particle materials, the self recovery fuse to KK ohm internal resistance value level. In order to limit the short circuit current and high current, the circuit circuit is in a state of disconnection. The self recovery fuse in high temperature and high resistance state, through effective test 24 hours is always in high resistance state.
When the fault current is eliminated, the temperature of the material inside the fuse is reduced, and the polymer is re crystallized. The entire working circuit is back to normal. Since the restoration of the fuse has automatic recovery, no artificial replacement. After testing for 10 thousand consecutive times without failure. Ten thousand fuse. Can completely replace the ordinary thermal fuse.

From the electronic related article:

　　Application scheme of over current protection of self recovery fuse in noodle machine

　　Multi protection scheme of small home appliances over temperature surge surge