[Elecraft] power switches for 120 and 240 volts

[Geert Jan de Groot]

I am switching the power supplies of my QO100 transverter chain 
(multiple transverters and all) with a solid-state relay controlled by 
the 12V output of the K3 (I think K4 has something similar).

Given that the KPA500 has a heavy transformer, you will want a solid 
state relay that can take a heavy startup surge.
Other than that  - "these relays have screw contacts" - it should be 
simple to construct something.

Brands to google for is Carlo Gavazzi, Finder, and others.

My 12V output cable has a male and female cinch connector, so I can 
connect other devices from the same 12V output port using a daisy chain.

73,

Geert Jan PE1HZG