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solid state contactors

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Fred Klein

Joined: 26 Mar 2012
Posts: 503

Posted: Tue Sep 03, 2013 11:04 am Post subject: solid state contactors

I'm wondering if anyone has installed or has the expertise to evaluate these:



	http://www.periheliondesign.com/powerlinkjr/PowerLinkJrIIIManual.pdf



thanks for any insights,



Fred

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frans(at)privatepilots.nl
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Posted: Thu Sep 05, 2013 12:04 pm Post subject: solid state contactors

On 09/03/2013 09:03 PM, Fred Klein wrote:

 	  Quote: 	
		   

 

 I'm wondering if anyone has installed or has the expertise to evaluate these:

 

 	http://www.periheliondesign.com/powerlinkjr/PowerLinkJrIIIManual.pdf

 

 thanks for any insights,


	


Yeah, I have seen them too. For some purposes they could be fine.

However I just use regular switches for almost all low power purposes.

In the case I need relays (like for high current devices) I like to use

real relays instead of SSR's. Look at the heat sink these SSR's have.

They are there for a reason. The reason is voltage loss (and subsequent

heat production in the relay). And one of the reasons you use a relay

instead of a switch is to eliminate voltage loss due to lenghty wires.

So these SSR's negate their own purpose in some way.



I use regular car relays for high current switching purposes. Our

aircraft see much daily less use than cars, and if these relays are fine

for daily use in a car, they should be fine for an aircraft as well.



Frans

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paul.the.aviator(at)gmail
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Posted: Thu Sep 05, 2013 3:31 pm Post subject: solid state contactors

Hi Fred,



I did use one of his SCS switches about 6 or 7 years ago as my main contactor (not starter relay).  My main attraction was that SCS does not have a hold in current and as you are aware the Rotax alternator is fairly weak.

 



If worked okay for about 18 months and then one day the engine kicked back while it was cranking and it destroyed it.

I think his new product has a much higher current rating, however I still do not know if it is robust enough for this application.

 



In your case it solves problems you don't have and creates new ones. 

Regards Paul.





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