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How to correctly choose the high voltage fuse

 High-voltage fuse is a kind of protection device for power and lighting circuits, when a short circuit or failure, can quickly cut off the power supply, the protection circuit and electrical equipment safety, then we should be how to choose and use high voltage fuse?

 
Selection of high voltage fuse principle:
 
A, in accordance with the circuit requirements and installation condition selection fuse model
 
Circuit capacity small selection of semi-closed or closed without filler; selection of large short-circuit current filling closed type; selection of fast fuse semiconductor element protection.
 
In accordance with the line voltage B, rated voltage fuse
 
C according to the load characteristics, choice of rated current fuse
 
D, select all melt should be compatible with each other, after a level than the preceding one small, the total gate and each branch line current are not the same, select the fuse is not the same. Such as short circuit, 15 A and 25A fuse will fuse, protection characteristics will lose selectivity.
 
E, the melt can not choose too small
 
If the choice is too small, easy to appear a fuse, causing motor single-phase operation and burn; according to motor statistics 60% burned all insurance configuration by the improper.
 
Fuse for high voltage fuse and low-voltage fuses two categories:
 
For 3kV-35kV for high voltage fuse;
 
For AC 220V, 380V and DC 220V, 440V is a low voltage fuse.
 
High-voltage fuse is divided into indoor and outdoor two.
Common low-voltage fuse inserting type, tube type, screw type three categories. It can be divided into open type, semi-closed and closed three.
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