I'd like to make a button which sets / resets latching relay through arduino, which means that after power outage the relay keeps the position. For example if the LED bulb is powered on and power outage occurs, the relay keeps the position. After power comes on, the LED bulb is powered automatically as the relay haven't changed the position. I have found this relay:
Is this relay fits my requirements? This relay is SPST-NO, but I can't understand why does that matter on latching relays (why does it matter if its NO or NC) because I can change relay state and leave it until I want to change the state again? Also, can I even send signals from Arduino directly to this relay, or I should choose 5V relay instead of 12V?