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eschlanser
Joined: 08 Apr 2010
Posts: 60
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 Posted: Mon Apr 19, 2010 6:58 pm Post subject: switch breaker on ALT field |
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While in the design stage of an electrical system for an OBAM homebuilt done according to Z-13/8 and Z-24, I have searched the archives and have only managed to find a partial answer. So I will ask directly of Bob and the group. Is there any reason that the panel circuit breakers alongside the ALT switches cannot be combined into two combination switch/CB's, (assuming I can find reliable devices)?
Thanks in advance,
Eric Schlanser, W-10 with Lycoming and Denso IR main ALT with B&C SD-8 aux ALT
[quote][b]
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rckol
Joined: 14 Nov 2008
Posts: 36
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| Posted: Tue Apr 20, 2010 12:50 pm Post subject: Re: switch breaker on ALT field |
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Switch breakers will function for this application.
I have read conflicting reports about the long term reliability of these. Some folks end up tearing them out because they don't hold up and others have no trouble with them. Sorry, I don't have any brand specific recommendations. I am not going to use them.
Dick
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rck |
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nuckolls.bob(at)aeroelect
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| Posted: Tue Apr 20, 2010 7:36 pm Post subject: switch breaker on ALT field |
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At 03:50 PM 4/20/2010, you wrote:
| Quote: |
Switch breakers will function for this application.
I have read conflicting reports about the long term reliability of
these. Some folks end up tearing them out because they don't hold
up and others have no trouble with them. Sorry, I don't have any
brand specific recommendations. I am not going to use them.
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The mil-qualified sw/breakers are fine. Actually, the
P&B W31 series are reasonably decent too. There's about
80K in service in Bonanzas and Barons since way back
when . . . and yes, a few have failed in a way that
put smoke in the cockpit . . . but those were the 30A
devices that control electric prop de-ice.
Obviously, you can't get the features in single
switches of any kind that are offered in the progressive-
transfer 2-pole toggles (2-10, 2-50, 2-70) but if your
design goals don't require this feature, then the
single switches will do.
Now, having said that, I'm not sure I'd recommend
the W31 used upstream of a crowbar ov protection system
that I designed. I've not studied the trip dynamics of
this device in that application. The miniature TI/Klixon
style breakers have been paired with our crowbar ov
systems by the thousands with good service histories.
Bob . . .
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