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Old 5th January 2004, 04:40 PM   #1
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Default fast / slow blow fuses

I am curious as to how fast or slow those fuses blow. I remember that it depends on their melting integral and fast blow fuses can go in milliseconds.


but I haven't seen a datasheet for fuses so I am just curious about this in general.

Any suggestions?
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Old 5th January 2004, 05:05 PM   #2
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You could setup a test, and blow a few under a controlled enviorment. Shouldn't be to expensive, I would be very interested to see the results.

Although how would you measure with a low degree of error the start to blow time which under some instances could be only a few ms's.

Maybe all on one board, fuse holder 555 timer and and a fast counter trigered by current on the fuse?

A little out of my relm but interesting.
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Old 5th January 2004, 05:22 PM   #3
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There are datasheets even for fuses. Just surf to any manufacturer, LittleFuse maybe?
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Old 5th January 2004, 05:49 PM   #4
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You can probably reach the datasheets quickest by lokking up a fuse you like on digikey.com. They have links to the data sheet.

BTW, the relationship between the stated rating of a fuse and under what conditions it will blow is more than a little interesting. Anyone building power supplies and amps should really take a look at these data sheets - you may be just a little surprised.
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