保险丝作为瓷插式熔断器和瓷底胶盖开关内的熔体被广泛采用。它能起到电气线路和电器设备的短路保护。保险丝有两个功能:一是有电流通过它就发热;二是当电流增大到一定程度时,它所产生的热量可使其自身熔断,从而切断电路。 Fuses are widely used as melts in porcelain plug-in fuses and porcelain bottom cover switches. It can provide short-circuit protection for electrical circuits and electrical equipment. The fuse has two functions: one is that the current passes through it to generate heat; the second is that when the current is increased to a certain extent, the heat generated by the fuse can cause it to blow, thereby cutting off the circuit.