For that application even Radio Shack has 2.  Numbers 275-226 & 275-218.

My local NAPA store also had them in blister packs but I have not 
checked in awhile.
They were a little more in cost than Radio Shack.

A relay in this usage is a mechanical current amplifier.

73,
Bob
K2TK

On 8/21/2010 1:09 PM, Don Cunningham wrote:
> I would think we users are getting to a point where a good, automotive relay
> designed for continuous duty usage would be a good idea here.  Simply use
> the 12v auxilliary power to feed the coil of the relay and let the contacts
> of the relay feed power from our 12v supplies.  I don't remember the stock
> numbers of the parts, but we used these in an oilfield industrial
> application a few years ago and had VERY few failures, and when we did, they
> were readily available local to the unit being used.  They have a multitude
> of mounts so they should be easy to integrate into the shack.  That's the
> route I plan to take, that is if the relay pulls less than 500 mills, hi.
> 73,
> Don, WB5HAK
>
>
>    
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