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How to connect relay 3 and 4 on SR-4 with mutual blockage

In some cases, you need to use relay 3 and 4 on a Switching Relay 4 for a lift or a second screen in your setup. And in this case, you might also want to add some extra safety for the motor not to be able to run both ways simultaneously.

Follow the diagram below to make the correct connections for this:

 

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