Relay Shield v3.0 The Relay Shield utilizes four high quality relays and provides NO/NC interfaces that control the load of high current. Which means it could be a nice solution for controlling devices that couldn’t be directly controlled by Arduino’s Digital I/Os.
Relay Shield for Arduino V2.1One of the most interesting projects for your boards is perhaps being able to control High power devices like Lamps, water pumps, garage doors and so on.
RboardRboard is a unique Arduino board which features 4 channels isolated relays, an XBee socket, and an ATMega328. This board will add relay control as well as wireless connectivity to your projects. It’s great for anything from home automation to robot control. The possibilities are endless!