Re: (ET) 24V relays

["David Roden" <etpost drmm net>]

On 28 Jun 2011 at 10:17, Bob Brandon wrote:

> How about these Solid State relays?

Most SSRs are for use in AC circuits only.  They depend on the voltage 
going 
to zero 120 times per second, so can't be used on DC.

The one relay you show as rated for 60vdc might be useful, with some major 
caveats.  It's probably a SPST NO relay; if so, you couldn't use it for ET 
field control.  It might be usable for something else, as long as you 
stayed 
well within its ratings (I'd suggest not exceeding 3a on a 5a SSR).  You'd 
also have to limit the control voltage to 12v.  

Remember that SSRs always have higher on-state resistance (and thus lower 
efficiency) than mechanical relays.  Also, when they fail, they usually 
fail 
ON.


David Roden - Akron, Ohio, USA

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