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Siemens fuse in Germany refers to an electrical appliance that fuses the melt and breaks the circuit with the heat generated when the current exceeds the specified value. The fuse is to melt the melt with its own heat after the current exceeds the specified value for a period of time, so as to disconnect the circuit; A current protector made using this principle. Fuse is widely used in high and low voltage distribution systems, control systems and electrical equipment. As a protector for short circuit and overcurrent, it is one of the most widely used protective devices.

Working principle: a kind of electrical appliance that uses metal conductor as melt in series in the circuit. When the overload or short circuit current passes through the melt, it will fuse due to its own heat, thus breaking the circuit. The fuse has simple structure and convenient use, and is widely used as a protective device in power systems, various electrical equipment and household appliances.