4x Powerful AC240V 10A / DC24V 10A relays can switch devices on or off. These relays has 100.000 to 10.000.000 on - off life, according to the load.
NO and NC Terminals
Normally open and normally closed pins of the relays are both connected to the terminals.
If you'll be using more than one shield, Arduino's internal regulator might not be sufficient. In this case, Relay Shield uses its onboard regulator to power the relays from Vin.
Photocouplers between Raspberry Pi and relay control circuit protect your system from ripples.
Arduino pinouts are extended with their labels. You can use other shields with Relay Shield unless there is no pin conflict.
There is a small circuit diagram on the back of the board to display how the system works.
We care our environment. Turta boards are PB-free and RoHS compliant.