Hi, thank you for your help. I am having fun experimenting with an arduino. I have a solid state relay (SSR) which I am learning to use for the first time. I have found things sort of confusing, but have found the following image at the Arduino playground useful: Image here Here is what I have so far. The problem is that it tells me connect relay power + and relay power - at certain points in my network. What exactly does this mean? I would like to power a servo motor through my relay for fun, using the relay to provide some degree of electrical isolation. Does 'relay power' refer to the power which will drive this motor, or something else entirely? Can I just connect these points back to the 5V header and GND on my arduino board? As well, my actual SSR is the CN024D05. If I can figure out how to wire this up properly, does the motor--side of the relay need anything? I've seen some documentation warning about inductive loads: would a servo motor be a problem? I have some fuses since I had a feeling it would be a good idea.