Quick update, I am using these float switches inline to control contactors/relays on the AC side to protect against dry firing of elements and also to control a relay for auto sparge for a pump. If a SSR fails, it will fail closed with electricity flowing. All switches need to be on the AC side of a SSR, not the DC side. And trust me, 208v 3phase contactors to handle 60 amps is not cheap. Holy hell. But, the added protection is priceless.