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Slow-blow fuses are not as protective as fast-blow fuses?

Slow-blow fuses are not as protective as fast-blow fuses?


Some people think that when a circuit encounters a fault current, the faster the fuse, the better, and the stronger its protection function. In this sense, the performance of a slow-blow fuse is not as good as a fast-blow fuse.


Indeed, under the same overcurrent load condition, the action speed of the slow-blow fuse is slower than that of the fast-blow fuse, but this is not because it responds slowly, but because it requires more energy to blow, it can be said that it is not only It has the ability to respond to overcurrent, and also has the ability to judge the type or energy of the overcurrent. The delay time during the operation can be regarded as the time for the slow blow fuse to judge the overcurrent.


Generally speaking, overcurrent can be divided into two categories: surge and fault. The surge overcurrent is mostly caused by the charging and discharging of the circuit switch or the influence of the surrounding circuit. The pulse peak is large and the duration is short. The energy released is often not large. The slow-blow fuse can withstand such overcurrent impact without Causes fuse action. (Related reading: Application scope and role of resettable fuses)


The fault overcurrent is continuous. Even if the peak value is not necessarily high, its energy must greatly exceed the surge overcurrent. Slow-blow fuses will react quickly and blow out as usual. So from this perspective, slow-blow fuses The slightly slower operation speed not only does not affect its protection function, but enhances its protection function, avoids the opportunity of misoperation, and can be applied to a wider range of occasions to protect multiple circuits.


On the contrary, fast-acting fuses can blow their action due to smaller energy. Although the action speed is fast, the reasons are limited, especially in capacitive or inductive circuits. If the surge current is more obvious in the circuit The use of fast-acting fuses often causes the fuse to malfunction due to pulse current, which makes the electrical appliance unable to start and use at all. It is meaningless to have strong protection performance.

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