The first function a good fuse has is a maintenance function. Under normal circumstances, the additional current of the fuse must be greater than the normal operating current of the circuit.

And have a certain overload capacity, but the margin can not be too large.



The second function of a good fuse holder is the load-bearing function, which is commonly referred to as pulse resistance. During the use of the fuse,

The chances of presenting normal current fluctuations or transient pulses are much greater than fault overcurrents, and this consideration is particularly important for the use of fuses.



The third function a good fuse has is a safety function. A high-quality and reliable insurance should ensure safety before, during and after the action.

That is, safely conducting and safely fusing.



To sum up, proper fusing characteristics and extra current; satisfactory and reasonable melting heat value; and proper breaking capacity, extra voltage and safety certification are

Necessary to ensure the main function of the fuse.



Several factors can affect the performance of a fuse:



1. Internal resistance of the fuse: The increase of the initial internal resistance or the increase of the internal resistance after the aging of the fuse will lead to the change of the heat dissipation conditions after the insurance is completed, so that the fuse's melting time will be faster.



2. The connection of the fuse: The reliable connection of the fuse in the circuit is an important part to ensure the performance of the fuse. If the touch resistance of the connection part increases, the effect is the same as the increase of the internal resistance.



3. Surrounding heat dissipation conditions: the distance between the fuse and the heating element, the density of the components in the circuit, the cross-sectional area and length of the connecting wire or the PC board are all related.



For small-sized fuses, if their internal resistance is large and the operating voltage is very low, sometimes there will be no current output. This is not a problem with the fuse.



caused by other external factors. In addition, improper selection of fuse technical parameters such as fusing characteristics, extra current, extra voltage, breaking capacity, etc. will definitely affect the



The fuse is functioning normally as it should.