Re: How to calculate current to melt wire?
- From: "Mook Johnson" <mook@xxxxxxxx>
- Date: Thu, 22 May 2008 20:52:36 -0500
"Michael" <nleahcim@xxxxxxxxx> wrote in message
news:12285dfc-2e08-4c96-ac0f-fe0b3c212aa8@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Hi there - I found an interesting failure on a PCB today. A large part
of one of the leads of a TO-220 was simply gone. That pin was carrying
a fairly high voltage and got shorted to ground.
Does anybody know how much current it would take to blow a TO-220 pin
like this? Additionally, is there a rough calculation for how to find
out how much current would actually melt a wire in open air?
Thanks!
-Michael
Its not just the DC current but the instintanious current that can fuse a
wirelink. A surprisingly small high voltage capacitance discharged across a
link of wire can blow it as well.
.
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