normally open vs normally closed.What is a self recovery fuse

　　1、 What is a self recovery fuse

　　Self recovery fuse is an overcurrent electronic protection component that uses a polymer organic polymer under high pressure, high temperature, and sulfurization reaction conditions

　　After mixing with conductive particle materials, it is processed through a special process. Habitually applying PPTC (Polymer Positive Temperature)

　　Coefficent, also known as a self restoring fuse. Strictly speaking, PPTC is not a self restoring fuse, and Resettable Fuse is a self restoring fuse.

　　2、 Principle of self recovery fuse

　　The self recovery fuse is made of high-tech polymer resin and nano conductive grains through special processing. Under normal circumstances, nano conductive grains

　　The body forms a chain like conductive path along with the resin based link, and the fuse operates normally; When a circuit experiences a short circuit or overload, the large current flowing through the fuse causes its temperature to increase. When the Curie temperature is reached, the density of states rapidly decreases, the phase transition increases, and the internal conductive link changes or breaks in an avalanche state. The fuse transitions to a high resistance state in a stepwise manner, and the current is quickly and accurately clamped to limit and protect the circuit. The small current keeps the fuse in a protected state, After power outage and troubleshooting, the temperature of the fuse decreases, the density of states increases, and the phase transition recovers. The nanocrystals are reduced to a chain like conductive path, and the self restoring fuse returns to its normal state without the need for manual replacement.

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