Self-fuse: The melt is used as a melt with high conductivity at room temperature. When the circuit is short-circuited, the short-circuit current produces a high temperature to rapidly vaporize sodium, and the vapor sodium presents a high impedance, thereby limiting the short circuit current. When the short-circuit current disappears, the temperature is lowered, and the metal sodium restores the original good conductivity. The self-reciprocating fuse can only limit the short circuit current, and the circuit cannot be truly discovered. The advantage is that it is not necessary to replace the melt and can be reused.
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