I'm curious, this is my first introduction to poly fuses...  I found a
few from Littelfuse, and they look interesting, but not enough info to
satisfy me...

The ones on Littlefuse seem to have a huge temperature coefficient so
when they get shorted through they heat up and become a highly-resistive
pretty-much-open-circuit kind of thing.

- Are they reliable?
- Are they safe to have in a commercial product?
- Are they more resistive in the non-open state than a normal
glass/blade/whatever fuse? (i.e. am I gonna waste batteries with these)
- Do they really protect?  Current has to sneak through in order for the
temperature increase, so it seems risky.

Curious who's used them and where, they seem like a perfect solution to
most things I would use a fuse for, there's gotta be a catch!

Nick Veys | nick@veys.com

> Poly fuses reset themselves.
>
> Jesse Lackey wrote:
>
> > Unfortunately reverse battery situation can happen easily and
> > repeatedly, having a fuse blow or a short across the battery is
> > unacceptable.  Tx anyway though.
> >
> > J
> >
> > Dal Wheeler wrote:
> >
> >> along that line, put a fuse or a poly fuse in it and use
> the parallel
> >> diode as a fuse killer in the event of a reverse hookup.

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