Loontus@aol.com wrote:
>
> << >There's no need for manual resetting or replacement. These devices are
> >available with trip points as low as 0.120 amps and as high as 9 amps. >
> >Littelfuse, which makes auto fuses, has a similiar product called Positive
> >Temperature Coefficient(PTC) Resettable Devices. >
> >RAYCHEM and Littelfuse both appear to be using some type of conductive
> >polymer in their circuit protectors in lieu of wire links and moving parts.
> >
> There's at least on product on the market using these devices. I've
> posted both a design review and a usenet thread which intereseted
> parties may read at <http://www.aeroelectric.com/xpbusthd.html> >>
>
> I have heard someone say that if very high currents are available in a system
> with CBs that the CBs can explode and/or catch fire and/or weld closed and
> 'cause' a fire (upon a sudden, complete short), whereas fuses are MADE to
> melt (even to the point of vaporizing), there by efficiently handling the
> situation. If that possibility exists, both should be used, in series, with
> the fuse a certain percent above the CB. (Not me, but I see the logic.)
> Comments invited.
> Dave
I've had the wondrous experience of a P-O-W of a 30 amp fuse in auto
panel. Gets your attention, it does!
Now use Heinneman (sp?) resettable breakers. They pop out, I push back
in. If it doesn't stay in I refrain from trying to reset til problem is
figured out and solved.
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