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Making a fuse from wire for any current. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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Fuses are the most widely used. They are cheap and easy to manufacture, and in the event of a short circuit in the network, they protect the wiring from fire.
When a fuse blows, it needs to be replaced quickly. There is not always a spare fuse for the required current. The easiest way to make a protective fuse is from a wire of the appropriate diameter. Moreover, the wire diameter for the required melting (protection) current can be selected from the table, which shows the values for different metals. As a basis for fixing (soldering) a fusible insert, a burnt frame can be used.
| Current, A |
Wire diameter in mm |
Current, A |
Wire diameter in mm |
| Copper |
Alumin. |
Steel |
Lead |
Copper |
Alumin. |
Steel |
Lead |
| 1 |
0,039 |
0,066 |
0,132 |
0,183 |
60 |
0,82 |
1,0 |
1,8 |
2,8 |
| 2 |
0,069 |
0,104 |
0,189 |
0,285 |
70 |
0,91 |
1,1 |
2,0 |
3,1 |
| 3 |
0,107 |
0,137 |
0,245 |
0,380 |
80 |
1,0 |
1,22 |
2,2 |
3,4 |
| 5 |
0,18 |
0,193 |
0,346 |
0,53 |
90 |
1,08 |
1,32 |
2,38 |
3,65 |
| 7 |
0,203 |
0,250 |
0,45 |
0,66 |
100 |
1,15 |
1,42 |
2,55 |
3,9 |
| 10 |
0,250 |
0,305 |
0,55 |
0,85 |
120 |
1,31 |
1,60 |
2,85 |
4,45 |
| 15 |
0,32 |
0,40 |
0,72 |
1,02 |
160 |
1,57 |
1,94 |
3,2 |
4,9 |
| 20 |
0,39 |
0,485 |
0,87 |
1,33 |
180 |
1,72 |
2,10 |
3,7 |
5,8 |
| 25 |
0,46 |
0,56 |
1,0 |
1,56 |
200 |
1,84 |
2,25 |
4,05 |
6,2 |
| 30 |
0,52 |
0,64 |
1,15 |
1,77 |
225 |
1,99 |
2,45 |
4,4 |
6,75 |
| 35 |
0,58 |
0,70 |
1,26 |
1,95 |
250 |
2,14 |
2,60 |
4,7 |
7,25 |
| 40 |
0,63 |
0,77 |
1,38 |
2,14 |
275 |
2,2 |
2,80 |
5,0 |
7,7 |
| 45 |
0,68 |
0,83 |
1,5 |
2,3 |
300 |
2,4 |
2,95 |
5,3 |
8,2 |
| 50 |
0,73 |
0,89 |
1,6 |
2,45 |
325 |
2,6 |
3,11 |
5,6 |
8,75 |
Publication: cxem.net
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