company news about Characteristics of Fuses

The fuse generates heat due to the flow of current, and blows when it reaches a certain value. In order not to affect the normal operation of the system, the fuse 120S cannot be blown under 2.1 times the rated current; in order to effectively protect the system, the greater the overcurrent, the faster the fusing speed. For example, when the rated current is 2.75 times, the fusing time is between 0.4S-10S; when the rated current is 4 times, the fusing time is between 0.15S-3S; when the rated current is 10 times, the fusing time is between 0.02S-0.15S.

When the output of the power supply is short-circuited, the peak value of the input current is several times of the rated current of the power supply, but it usually remains within a few microseconds. Therefore, the short circuit and overcurrent at the back end of the power module will not cause the fuse to blow, and the protection of the back end circuit should be realized by the protection function of the power module.