http://www.futureelectronics.com/en/Search.aspx?dsNav=Ntk:PlainTextSearch%7cSolid+State+Relay%7c3%7c,Ny:True,Nea:True,N:562 During this video, we'll explain what is a Solid State Relay as well as how to select the right one for your application from our line-up of Solid State relay products. An SSR, or solid state relay, is an electronic switch that contains no moving parts and that has the same use as an electromechanical relay. http://youtu.be/H3Fdx5jK6JY