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From: Mike Poulton
Subject: Re: polyswitches in vacuum
Date: 20 Nov 2002 15:33:12 GMT
Organization: MTP Technologies
On 20 Nov 2002, Mike Hubert said:
> Since heat is allowed to build up the device will probably trip much
> quicker... but does it do so in a predictable way? I'm just wondering
> if there is some way of designing around this...
You could mount it on a black heatsink. Radiative dissipation will be
the only real mode of heat loss, and it takes a good bit of black
surface area to radiate much. AFAIK, the only reliable method of
determining the new characteristics of your polyswitch/heatsink combo in
a vacuum would be to test it in a bell jar. Keep in mind that the
circuit would only be protected when in a vacuum. The extra heat
dissipation in open air would keep it from tripping under anything but
the most extreme overloads.
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