Fuses ratings

[Andre Kesteloot]

Tacoistas

Last Saturday, at Tacos, part of the technical discussion was focused on 
short circuit-protection and electrical fuse ratings.
I remarked that a 1 amp fuse would not normally melt while passing a DC 
current of one amp.

Here are the data for a medium delay fuse: 
http://www.cooperindustries.com/content/dam/public/bussmann/Electronics/Resources/Data%20Sheets/bus-elx-ds-4395-gmc.pdf
*CooperBussman* states
at current rating  -> opening time
100%                            none
135%                            60 minutes max
200%                            120 seconds max

For a slow-blow ceramic fuse, *Littlefuse*  offers
100%                             4 hours max
135%                            60 minutes max
200%                            120 seconds max


Time vs current characteristics are usually of the type shown in 
http://www.sandc.com/edocs_pdfs/EDOC_002721.pdf

73
André N4ICK



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