What are those three devices? What terminals do what on your relay board? What do you want the devices to do when you switch the relays?
Sorry, I though it was obvious, those 3 devices are french outlets! The one at the top is the "input" of the relays, the two others on the right are the output (of course, wires will be behind
The terminals are, in order like in the schema:
And I will plug some devices in the output outlets, such as lamps, pumps...
Ok silasmoeckel, I think the relay board I buyed, is "active LOW", not sure what that mean yet