Hello, i'd like to switch on/off a lamp similar to this using arduino.
Does this is good for me?
Datasheet tell me input is 5V and ouput 220V, 2/3A is good.
Have i to check anything else?
Yes but you can't drive this relay directly from the Arduino you need some sort of driver. Look at this link, although it is about motors it talks about driving relays half way down the page. Motors 1
Another solution would use X10, see this article:
http://www.arduino.cc/playground/X10/CM17A