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How to Choose Current-limiting Fuse?


The rated voltage and current of the high-voltage current-limiting fuse are specified, so how to choose?


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First, Selection of the rated voltage of the high-voltage current-limiting fuse

1. Do not lower the voltage to use, otherwise when the melt cuts off the current, the voltage generated will be higher than the voltage allowed by the grid, and it will be about 25 times higher than the working voltage.

2. If the fuse uses a three-phase circuit, the rated voltage you choose should be selected according to the corresponding rated voltage. If it is single-phase, then the rated voltage should choose 115% of the corresponding rated voltage.

3. The neutral point of the three-phase adopts an insulation system or a resonance grounding system, so it is prone to double ground faults. At this time, the rated voltage of the fuse should be selected according to the highest line voltage.

4. If the neutral point of the three-phase is directly grounded or the system is grounded via an impedance neutral point, the selection should also be based on the highest line voltage.

 

Second, the selection of the rated current of the high-voltage current-limiting fuse


1. The current of the fuse tube must be at least equal to the current of the melt.

2. If the rated current is 1.25 times of the long-term load.


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