Interconnected 120 Volt AC Smoke Detectors Alarms circuit can be connected to professional security alarms systems with relay modules. Smoke alarms are required to be interconnected to each other and most smoke alarm manufactures make a relay module that can also be used to interconnect to security alarm systems for sending emergency signals for dispatch to your local fire department.
Kidde Relay Power Supply Module SM120X
Most acceptable & effective method for connecting interconnected 120 Volt AC smoke alarms into local home security alarm system for sending local emergency personnel - hashtagfire department