Relé 5V DC 8A 2 Duplo Contacto DPDT - Finder

Relay, as its name implies, implements a relay function. The relay can be used as a switch operated electrically through the coil to mechanically operate a switch, where it is sometimes necessary to control a circuit of another voltage and current load through a separate low power signal, such as a digital signal emitted by a mircoprocessor. Up to 30V DC and 220V AC.

In/Out Shield for your Arduino, Velleman.

8 relay module with ports " NC " means " Usually connected to COM " and ports "NO" means " Usually open to COM ".