First Alert 3120B

120VAC Hardwired Photoelectric and Ionization Smoke Alarm with Battery Backup

  • Factory New
Brand: First Alert Part #: 17030 Category: Manufacturer Part #: 3120B


The 3120B is a wire-in, 120 V AC 60 Hz single and/or multiple station photoelectric and ionization dual sensor smoke alarm specifically designed for residential and institutional applications including sleeping rooms of hospitals, hotels, motels, dormitories and other multi-family dwellings as defined in standard nape 101. Model 3120B complies with UL217, CSFM, nape 72, HUD, fa and other agencies that model their codes after the above agencies. It meets building codes where AC/DC photoelectric and ionization combination smoke alarms are required. The 3120B is a state-of-the-art hardwired with battery backup smoke alarm that features dual photoelectric and ionization smoke sensing technologies.


Weight .85 lbs
Dimensions 5.7 × 5.7 × 2.4 in

First Alert

Production Status



  • Photoelectric and ionization sensors for comprehensive smoke and fire detection
  • Hardwired alarm includes battery backup for power outages
  • Single button to test detector monthly or silence during a false alarm
  • Latching features indicate low battery or originating alarm in a system
  • Patented Optipath 360 technology provides 360 degrees of access


First Alert – Data Sheet