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Switch contact rattings which is best for this app

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jskiba(at)icosa.net
Guest

Posted: Sat Sep 09, 2006 11:26 am Post subject: Switch contact rattings which is best for this app

Okay,



I Have gone and confused myself, I am looking at ordering some switches for

my OBAM aircraft and can't rember which would be better Higher current

switch



The catalog states two options:



1: Silver Rated 3A (at) 125V AC

2: Gold Rated 0.4 VA max (at) 28V AC/DC max

My application will be used in a 12-14 Volt system I want the switch with

the higher switch capability which is it?



THANKS in advance

P.s. my guess is option one the silver contacts but for some reason I don't

think that is correct....



--

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FLYaDIVE(at)aol.com
Guest

Posted: Sun Sep 10, 2006 3:57 am Post subject: Switch contact rattings which is best for this app

In a message dated 9/9/06 3:29:38 PM Eastern Daylight Time, jskiba(at)icosa.net 

writes:



 	  Quote: 	
		   

<jskiba(at)icosa.net>
	


 	  Quote: 	
		   

  

   Okay,

  

  I Have gone and confused myself, I am looking at ordering some switches for

  my OBAM aircraft and can't rember which would be better Higher current

  switch

  

  The catalog states two options:

  

  1: Silver Rated 3A (at) 125V AC

  

  

  2: Gold Rated 0.4 VA max (at) 28V AC/DC max

  

  

  My application will be used in a 12-14 Volt system I want the switch with

  the higher switch capability which is it?

  

  THANKS in advance

  

  

  P.s. my guess is option one the silver contacts but for some reason I don't

  think that is correct....

===================================
	


OK, here is the break down:



Silver is the better conductor - But - Oxidized much more.

Gold is obviously slightly less in conductivity (but, you will never know 

that) than Silver - But - for the practical, does not oxidize.



Without getting ridiculous in explaining a switch ... If you Double the 

Voltage you Half the current.  So a Switch that is rated at 0.4 Amps (at) 28 VDC will 

be able to handle 0.8Amps (at) 14 VDC.



As for your amperage rating of the switch:

1 - Find out what the circuit draw at MAX will be.

2 - Use a switch that is about 50% over rated than the MAX draw.

3 - If a switch is rated in AC DE-RATE the amperage by 36 to 40%

[This is a rule of thumb.  It has NEVER FAILED for me.  Some pencil pusher 

may have worked out a more accurate number but definitely not a better one.]

Barry

"Chop'd Liver"



"Show them the first time, correct them the second time, kick them the third 

time." 

Yamashiada

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