-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Mike Hord
Sent: Friday, October 13, 2006 2:15 PM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Odd fuse failures

> That makes me think vibration even more.
> You get nodes that vibrate a lot, and others that vibrate very little.
> I've seen chips pop out of sockets, and even ceramic chips soldered in
that
> blew their tops.

Very interesting thought.  I suppose it's possible.  This isn't a new
machine,
though- we've shipped dozens all over the planet and this is the first time
this
has happened.

The general consensus seems to be that current related failure is not very
likely, though.

It's a 5A, 125V fuse.  Not a slow-blow, so inrush COULD be a factor.

The fuses are all mounted cheek-by-jowl on a DIN rail.

Mike H.

If you think about it the ENDS of the fuse are the greatest heat sink
VERY unlikely to fuse there, rather in the middle where the thermal 
Effect is greatest.

  *
  |  __O    Thomas C. Sefranek  WA1RHP@ARRL.NET
  |_-\<,_   Amateur Radio Operator: WA1RHP
  (*)/ (*)  Bicycle mobile on 145.41MHz PL74.4
 
ARRL Instructor, Technical Specialist, VE Contact.
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