As with other companies, we were forced to make a design change when the SSR we used on the SSR-2 went EOL (end-of-life). We found one that doesn't handle quite as much current, but it still handles as much as we would put through the board, anyway. The product documentation (http://www.efx-tek.com/downloads/ssr-2_docs.pdf) has been updated.
(http://www.efx-tek.com/files/ssr-2_revC1.png)
In the new year we will offer the RC-1 and AC-1 for those who need just one relay, not two.