Using this power switch is a breeze. First, find a suitable place for it, like in your machinery or remote - control project. Feed the power cord through the hole in the metal box. You can connect up to three pairs of wires. To access the inner wiring, simply turn the thumbscrew. Once the wires are connected, when you want to turn on the power, just press the ON button. To turn it off, press the OFF button. As for safety, even though the sticker says it's rated for 380VAC / 1.5kW, it's best to use it with a voltage of no more than 24V and a current of no more than 10 Amps. For maintenance, keep the switch clean and dry. If you notice any loose wires or other issues, turn off the power and check the inner wiring using the thumbscrew.