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flagstone(at)cox.net
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 Posted: Mon Dec 10, 2007 5:45 pm Post subject: Switch Rating |
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Hi:
I recently joined this group cuz I'm working on an aviation project and have been reading the Aeroconnection manual. In past non aviation projects I've bought switches from Radio Shack etc that I've used in 12v systems. The rating on some of these switches only gave the AC rating say 15A.125VAC. I always assumed that if it was good for 15amps at 125v it was ok for the same amps at 12v. However, I'm trying to understand how all this works now. So the question is, can you convert that AC rating to DC and if so, how. I read in the manual where there was a resistive, inductive and tungsten rating for switches but not a AC - DC conversion. I also saw that V x A = W but that would give the switch about a 156A rating which doesn't sound right. Sorry if this is a stupid question or if its in the manual someplace and I've missed it.
Mark
[quote][b]
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nuckolls.bob(at)cox.net
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| Posted: Mon Dec 10, 2007 9:34 pm Post subject: Switch Rating |
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At 05:41 AM 12/11/2007 -0800, you wrote:
| Quote: | Hi:
I recently joined this group cuz I'm working on an aviation project and
have been reading the Aeroconnection manual. In past non aviation
projects I've bought switches from Radio Shack etc that I've used in 12v
systems. The rating on some of these switches only gave the AC rating say
15A.125VAC. I always assumed that if it was good for 15amps at 125v it was
ok for the same amps at 12v. However, I'm trying to understand how all
this works now. So the question is, can you convert that AC rating to DC
and if so, how. I read in the manual where there was a resistive,
inductive and tungsten rating for switches but not a AC - DC
conversion. I also saw that V x A = W but that would give the switch
about a 156A rating which doesn't sound right. Sorry if this is a stupid
question or if its in the manual someplace and I've missed it.
|
See:
http://www.aeroelectric.com/articles/Switch_Ratings.pdf
If you're designing a failure tolerant system,
then switch replacement due to a lapse in
judicious selection is a maintenance issue,
not a safety issue.
Bottom line is that just about ANY switch you
choose to try in your airplane is unlikely to
die of old age as opposed to a ratings issue.
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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