Today's Message Index:
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1. 12:14 PM - Re: Polyfuses (marcausman)
2. 12:46 PM - Re: Re: Polyfuses (Robert L. Nuckolls, III)
Message 1
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Technically there's nothing wrong with polyfuses. But I am not a fan of using them
in an aviation application because you cannot control them directly like you
can an electronic (solid state) circuit breaker or old-style circuit breaker.
At least when a fuse blows the circuit stays off.
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Marc Ausman
http://www.verticalpower.com
RV-7 IO-390 Flying
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=233378#233378
Message 2
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At 02:12 PM 3/5/2009, you wrote:
>
>Technically there's nothing wrong with polyfuses. But I am not a fan
>of using them in an aviation application because you cannot control
>them directly like you can an electronic (solid state) circuit
>breaker or old-style circuit breaker. At least when a fuse blows the
>circuit stays off.
Sure. We (the TC guys) never had an arugment
with the ability of the polyfuse to perform
as advertised. Our problem was delivering to
traditional design goals of which you mentioned
two, control and non-self re-setting. The other
problem was that the parts are not bolt-in, wire
up and play. You have to install them on some
manufactured assembly that incorporates an
etched circuit board for mounting the parts.
Even if we popped for the custom assembly, the
TOTAL cost of acquisition/ownership wasn't
that much better than what we were already
doing. The breaker as a mil-qualified bolt-in-
and-play parts require no special attention
to mix and match as needed. A customized assembly
has to be designed, qualified and becomes very
hard to change once approved for the airframe.
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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