Why the fuse resistance is large
And because it has a certain heat and quality, the increase in heat is reflected in the temperature rise, when the temperature rose to the fuse above the melting point of the fuse occurred when the fuse
A fuse is also known as a current fuse, and the IEC127 standard defines it as a "fuse-link". It is mainly due to overload protection.
If the circuit is properly placed in the fuse, then the fuse will rise in the current to a certain height and heat, when the fuse itself cut off the current, so as to protect the safe operation of the circuit.
When the circuit fails or abnormal, accompanied by rising current, and the rising current may damage some important devices in the circuit or expensive devices, it is possible to burn the circuit or even cause a fire.
