4- Channel Arduino Relay Shield
This relay module allows you to combine the processing power of the Arduino to devices that use higher current and voltage. It does so by providing four relays that are rated for 10A at 125VAC.
There are four relays that each provide dry contact outputs. That is to say that each relay provides a common (COM) , normally open (NO) and a normally closed (NC) terminal.
With these relays you can control: