This is a relay breakout board which comes with full isolation using opto-coupler design. The relay comes with 5VDC, 12VDC and 24VDC version which has full isolation from the TTL/Digital output pins from your micro-controller or Arduino
The board also comes with easy solder pad at the back to allow you to thicken the connection either by adding more solder and soldering extra thick wires. This feature is good if you want to use the relay contacts (NO/NC) to control high current (DC/AC) devices.
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