In this second application we can use the DPDT switch to choose between 2 different load and have a visual indication of what load is connected. In our case (diagram 1) when there is no voltage ...

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The mode of operation is simple. A DPDT switch controls the linear actuator. Flipped one way, the linear actuator is fed 12 V in such a polarity as to move it to open the fan door. In this mode ...