A while back we took apart an SSR with the precision use of a hammer and screwdriver. There is a lot of stuff in that little black box. Here is some interesting info on them and how they work.
http://www.crydom.com/support/tips/pdfs/SSR the inside storynew.pdf
Also here is a good document on testing them
http://www.crydom.com/support/tips/testrelay.htm
http://www.crydom.com/support/tips/pdfs/SSR the inside storynew.pdf
Also here is a good document on testing them
http://www.crydom.com/support/tips/testrelay.htm