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　　Do not confuse these two important concepts when choosing a fuse

　　The two important concepts of fuses: thermal melting value and breaking capacity, as well as their differences and connections.

　　Is the melting value of a fuse important? In short, this is very important.

　　The melting value is to ensure that the heat generated by the fuse during a surge does not have enough time to conduct the heat from the fuse to the external circuit. Once the current I and time t are measured, the hot melt value I2t can be easily calculated. After the fuse is blown, it will generate an arc before disconnecting.

　　For fuses, they can have the same rated voltage and current, as well as the same rated breaking capacity, in the same response time category (slow, medium, and fast). However, there are many options for hot melt values.

　　Basically, the higher the melting value, the longer the fuse will take to melt, or the greater the surge that the fuse will withstand before melting. This is different from the breaking capacity of fuses, which refers to the maximum current that a fuse can withstand at a specified voltage before disconnecting the circuit or generating an arc. If the glass tube of the fuse breaks, the current has exceeded the fuse's breaking capacity. Sometimes the situation can get worse. If the breaking capacity of the fuse is not selected correctly, the fuse may break or explode. This may cause harm to the surrounding environment, especially in the presence of flammable gases. Like most electronic components, temperature and other derating factors should also be considered.

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