The typical way to connect the Pololu RC Switch with Relay is shown in the diagram below:
We generally recommend that you use a 4- or 5-cell NiMH or NiCD battery pack for the logic power supply. The power supply will typically be connected to the RC receiver, which passes the power on to the RC switch. The switch can be plugged directly into the RC receiver using a Female-Female servo extension cable. These can be found in our Servo Cables category.
One typical way of connecting the relay is to put it between the load and the positive terminal of the load’s power supply. The load is the device that you want to control with the RC switch. The negative terminal of the power supply should connect to the other side of the load. The negative terminal of the power supply does not necessarily need to be connected to the GND pin of the logic side. In the diagram above, the positive terminal of the load power supply is connected to the NO pin and the positive terminal of the load is connected to COM. They will normally be disconnected, but when the switch turns on, the relay will activate and connect the two, allowing the load to be powered.
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