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　　The breaking ability of fuses

　　The breaking ability of a fuse is a safety indicator that has little to do with its electrical performance, and is often overlooked by manufacturers or users. Some people even do not know that fuses have breaking ability as a technical indicator.

　　As a safety component, the fuse needs to ensure the safety of the circuit and other components at all times. Therefore, the first thing to ensure is that it is sufficiently safe in any situation, especially during the operation of the fuse, no unsafe factors can occur, including continuous arcing, re conduction, combustion, splashing, and explosion. Breaking ability is one of the indicators reflecting the guarantee ability of fuses.

　　The parameter unit of breaking capacity is ampere, which means that the fuse can safely break the maximum current of the circuit. That is to say, as long as the overcurrent in the circuit does not exceed the breaking capacity of the fuse, the fuse can ensure the safe cutting off of the current without any unsafe phenomena; On the contrary, although fuses can cut off circuit current, they may not guarantee absolute safety, so breaking ability is not an optional indicator.

　　In order to ensure the safety of fuses, when selecting fuses, in addition to considering necessary performance parameters such as current capacity, melting characteristics, anti pulse ability and aging speed, impedance and power consumption, temperature reduction, we also need to consider safety indicators such as breaking capacity, rated voltage, and safety certification.

　　For small tubular fuses of European specifications, there are two types of fuses with the same appearance and size: low break fuses and high break fuses. The breaking capacity of low break fuses is specified as 10 times the rated current or 35 amperes. The larger of the two is chosen, while the breaking capacity of high break fuses can reach up to 1500 amperes; However, there is no distinction between high and low breaking varieties for North American standard tubular fuses, and their specified breaking capacity indicators are much higher; 10000 amperes at 125V and 35-1500 amperes at 250V (depending on the rated current specifications of the fuse). The breaking capacity of surface mount type chip fuses is often around 50 amperes.

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