I have used this to connect my regular First Alert fire detectors to the fire zone of my VISTA20P alarm panel. Instead of a built in smoke alarm (special 4 wire smoke alarm in the security panel) I now have all 6. The relay is installed on one smoke alarm and I connect all the others to the 3rd orange wire. NC contacts are used to connect to the alarm panel. This requires AC power as the relay must be connected to 120V power lines. Therefore a loss of AC power will prevent the smoke alarm from being transmitted to the alarm panel. It won't take long, but it's better than nothing.
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