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bussmann fuse tube
Some precautions in the use of fuse tubes:
1. The rated voltage of the selected fuse should be greater than the input voltage of the protected circuit.
2. The rated current of the UL rated fuse is determined under laboratory conditions, and should be less than 75% of the nominal value in actual use. For example, if the working current of the circuit is 0.75A, a fuse tube with a rated current of 1A should be selected as the minimum.
3. The rated current of the IEC specification fuse tube can be used at 90% or 100% of the nominal value in actual use. For example, if the working current of the circuit is 0.9A, a fuse tube with a rated current of 0.9A or 1A can be used as the minimum.
4. The working life of the fuse is different under different operating environment temperatures. The higher the temperature, the shorter the working life of the fuse; in actual selection, the rated current of the fuse needs to be increased by a factor. The temperature influence curve has been marked in our product catalog for reference when selecting fuse tubes.
5. The breaking capacity of the fuse tube is proportional to its volume and inversely proportional to the rated voltage. That is, the larger the volume or the smaller the rated voltage, the greater the breaking capacity of the fuse tube; the smaller the volume or the larger the rated voltage, the smaller the breaking capacity of the fuse tube. Therefore, if a small size fuse tube is selected, it is necessary to determine that the possible short-circuit current of the protected circuit will not be too large; if the protected circuit may have a larger short-circuit current, a larger size fuse with a larger breaking current must be selected tube. The breaking current of each model and specification is indicated in the product catalog, and refer to when choosing fuse tube.
6. The surge I2T of the protection circuit should be less than 20% of the rated I2T of the fuse tube, and the fuse tube can withstand more than 100,000 surges in the protected circuit.