I needed this to start and stop my MMG55 emergency generator during a power outage using a pre-configured 2 wire switch! When the power fails, this relay closes, connecting the two wires that send a signal to the generator. When the power comes back, it opens the circuit and turns off the generator. This should have been built into the ATS but unfortunately my ATS doesn't even work. Switch back to mains when power returns, but now it starts the generator and sends power to the generator. In general, this relay helped me to go to the garage and manually signal the generator. The configuration indicated in the description does not work, I used a different configuration for my purpose.
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