Making a fuse from wire for any current. Scheme, description

ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
Free library / Electrician

Making a fuse from wire for any current. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Electrician's Handbook

Fuses are the most widely used. They are cheap and easy to manufacture and, in the event of a short circuit in the network, reliably 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, mm
Current, A	Copper	Aluminum	Steel	Lead
1	0,039	0,066	0,132	0,183
2	0,069	0,104	0,189	0,285
3	0,107	0,137	0,245	0,38
5	0,18	0,193	0,346	0,53
7	0,203	0,25	0,45	0,66
10	0,25	0,305	0,55	0,85
15	0,32	0,4	0,72	1,02
20	0,39	0,485	0,87	1,33
25	0,46	0,56	1,0	1,56
30	0,52	0,64	1,15	1,77
35	0,58	0,70	1,26	1,95
40	0,63	0,77	1,38	2,14
45	0,68	0,83	1,5	2,30
50	0,73	0,89	1,6	2,45
60	0,82	1,0	1,8	2,8
70	0,91	1,1	2,0	3,1
80	1,0	1,22	2,2	3,4
90	1,08	1,32	2,38	3,65
100	1,15	1,42	2,55	3,9
120	1,31	1,60	2,85	4,45
160	1,57	1,94	3,2	4,9
180	1,72	2,10	3,7	5,8
200	1,84	2,25	4,05	6,2
225	1,99	2,45	4,4	6,75
250	2,14	2,60	4,7	7,25
275	2,2	2,80	5,0	7,7
300	2,4	2,95	5,3	8,2
325	2,6	3,11	5,6	8,75

I would like to note that the fuse rating is the current that the fuse can withstand for a long time, and not the melting current. The fusible link must burn out in 10 seconds at a current exceeding the rated current by 2,5 times

Publication: electro.narod.ru

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