Detailed explanation of chip fuse performance classification.motorcycle fuse keeps blowing

　　Patch fuses can be divided into disposable patch fuses and patch self recovery fuses. After being protected by a disposable fuse, it needs to be replaced. After being protected by a self recovery fuse, it can be restored and reused after power failure.

　　But what should we pay attention to when choosing patch fuses? The editor suggests selecting fuses based on the following aspects: normal current, fusing current, open circuit voltage, short circuit current, impulse current, and ambient temperature.

　　Short circuit current: We refer to the maximum current that flows when a circuit is short circuited as the short circuit current. For various fuses, the rated breaking capacity is specified, and we must be careful not to exceed the rated breaking capacity when selecting fuses. If a fuse with a small breaking capacity is selected, it may cause the fuse to rupture or cause a fire.

　　Impulse current: Observe the waveform of the impulse current (pulse current waveform) and calculate its energy using the I2t value (Joule integral value). The impact on the fuse varies depending on the size and frequency of the impulse current. The ratio of I2t value of impulse current to I2t value of single pulse fusing determines the number of times a fuse can withstand impulse current.

　　Normal current: Firstly, we must know the normal current flowing through the fuse in the circuit used. Usually, we need to pre-set a derating amount and choose according to the following principle: the normal current must be less than the product of the rated current and the derating coefficient.

　　Fusing current: According to UL specifications, fuses should quickly blow at twice the rated current. But in most cases, to ensure reliable fusing, we recommend that the fusing current should be greater than 2.5 times the rated current. In addition, if the fuse time is important, it must also refer to the fuse characteristic diagram provided by the manufacturer to make a judgment.

　　Open circuit voltage: The open circuit voltage should generally be selected as less than the rated voltage. For example, when using a fuse with a rated voltage of DC24V in an AC100V circuit, it may ignite the fuse or cause it to rupture.

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