Hi Mike,

Recently at work we received a number of large industrial battery
chargers with broken fuses in them. It turned out that the fuses (one
each in perhaps 10 units) were broken by mechanical stress, probably
in shipment. The fuses were not the glass cartrige type but rather
forklift type fuses (flat fiberglass package with a mica window and
two metal tabs). We were able to determine that the two mounting
points for the fuse could move independently, thus placing mechanical
stress on the fuse. Also, the bolts holding the fuse in were
over-tightened.

So, I have seen something similar to what you are describing but it
was with a totally different type of fuse.

Sean


On 10/14/06, Mike Hord <mike.hord@gmail.com> wrote:
> There WERE fuses there.  The apps engineer pulled them and replaced
> them.  He just didn't send them home for investigation.
>
> And he didn't check OTHER fuses in the system, although they must
> be working or the machine would've still be offline.
>
> I'm leaning towards this being an incredibly unlikely series of events,
> unlikely to be duplicated and probably not something we'll ever see
> again.  I'm going to talk to our supplier, find out if they've heard any
> complaints about "broken" fuses elsewhere, and see if they recently
> changed fuse manufacturer/supplier.  Otherwise I don't think there's
> much to be done- it's not a HUGE problem, since it's something
> we're aware of now and if something similar happens on delivery
> again, we will know right away to check those fuses.
>
> It's good to know that nobody here has heard of this or has an "easy"
> answer for it.
>
> Mike H.
>
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