Question: Under what circumstances will the "resistance value" of self-recovery fuse be too large?
Answer: When the circuit is short-circuited or overloaded, the current flowing through the fuse is greater than that, so that the temperature of the fuse is concentrated and rises rapidly. When it reaches a huge temperature, the density of states decreases rapidly, the phase transition increases, the internal conductive link avalanches or breaks, the fuse gradually migrates to high impedance state, and the current is pinched off quickly.
Therefore, the fuse can quickly and accurately limit and protect the circuit. Its tiny current will always keep the fuse under protection.
The fuse is connected to the output of the DC regulated power supply, and then the current is slowly increased. When the current value increases to exceed the rated value of the fuse, the fuse will open. When the current decreases slowly, the fuse will be connected again, which is the protection principle of fuse.
