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rv-9a-online(at)telus.net
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 Posted: Thu Jun 25, 2009 12:53 pm Post subject: Magneto Switch Rating |
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Bob, I am having difficulty finding the electrical specifications required for toggle switches used as Mag switches.
There is both a withstanding voltage and a current carrying capability that needs to be met, and I have a need to use miniature toggle switches rated at 5A/120VAC/28VDC for this function.
Help appreciated.
Thanks, Vern
[quote] ---
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jun 26, 2009 9:07 am Post subject: Magneto Switch Rating |
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At 03:47 PM 6/25/2009, you wrote:
| Quote: | Bob, I am having difficulty finding the electrical specifications required for toggle switches used as Mag switches.
There is both a withstanding voltage and a current carrying capability that needs to be met, and I have a need to use miniature toggle switches rated at 5A/120VAC/28VDC for this function.
Help appreciated.
Thanks, Vern |
Hmmm . . . I've never seen a rating requirement for
mag switches. Can you give me a link or send me
a copy?
I've seen a host of switch styles used as magneto
switches where it was very unlikely that the installer
was cognizant of any recommendations/requirements. I
was thinking that this airplane . . .
http://aeroelectric.com/Pictures/Switches/miniswitches.jpg
had miniature mag switches too but they don't show
in the picture.
I'm not aware of any successful application of miniature
toggles for magnetos. Some years ago I had an inquiry
about using a miniature rocker switch.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=SW322-ND
I suggested that the builder hook the two sides of
a two-pole switch in series to effectively double the
gap for open contacts (mag operating). I think he did
this and I've not heard back.
I'll suggest the same thing for what ever switch
you plan to try. Go with double-pole switch an
use contacts in series to short the mag in the
OFF condition. I'm 99% sure that you'll find this
approach satisfactory.
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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[quote][b]
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marcausman
Joined: 08 Feb 2007
Posts: 70
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jun 26, 2009 2:10 pm Post subject: Magneto Switch Rating |
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At 01:26 PM 6/26/2009, you wrote:
Marc,
Thanks for sharing this. I'd not looked at the scope
trace on a mag p-lead in many years. I thought the voltage
was more on the order of 300v but that might be
across the points of the distributor rotor in my
283 Chevy! Too long ago . . .
Your data confirms that my suggestion to Vern offers
a robust solution to his design goal.
Busted 100 degrees down there yet?
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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rv-9a-online(at)telus.net
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| Posted: Fri Jun 26, 2009 6:39 pm Post subject: Magneto Switch Rating |
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Bob, Marc, thanks for the info.
Odd that in all the years, I've never seen a rating until Marc's reference.
Seems to be lost in the folklore.
Vern
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nuckolls.bob(at)aeroelect
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| Posted: Fri Jun 26, 2009 7:29 pm Post subject: Magneto Switch Rating |
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At 09:28 PM 6/26/2009, you wrote:
| Quote: |
<rv-9a-online(at)telus.net>
Bob, Marc, thanks for the info.
Odd that in all the years, I've never seen a rating until Marc's
reference. Seems to be lost in the folklore.
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It probably has to do with the fact that about
any switch you pick up at the hardware store is
adequate to the task. The voltages are not much
higher than peak AC waveform on 120 vac and the
current is very nominal.
Not a big deal electrically. The J-3 I used to fly
had those little ball-end handles common to the
front panel of grandpa's radio and grandma's
electric fan.
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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