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  BRK Electronics First Alert 3120B 120V AC/DC Dual Sensor Hardwired with two 1.5V AA Battery Backup Photoelectric and Ionization Smoke Alarm

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Need to replace BRK SA773CN?
This BRK 3120B can communicate with existing BRK SA773CN. However, you need to change the mounting bracket and the wiring harness
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Model: BRK-3120B

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Technical Spec Downloads
Technical Spec

Hardwired Photo/Ion smoke alarm provides double protection for both flaming and smoldering fires.

  • Utilizes both ionization and photoelectric smoke sensors for maximum protection
  • Two Latching Features - Alarm Latch and Low Battery Latch
  • Two Silence Features - Alarm Silence and Low Battery Silence
  • Two AA Battery Backup
  • Optipath 360 Technology
  • 10-Years Limited Warranty
Model # 3120B
Weight 9.5 oz
Dimension 5.0" dia x 2.0"H
Operating Voltage 120V AC 60Hz w/ two 1.5V AA battery backup
Operating Current 0.07 amps (standby/alarm)
Temperature Range 40°F (4°C) to 100°F (38°C)
Humidity Range 10% to 90% relative humidity (RH)
Audio Alarm 85dB at 10 feet
Test/Silence Electronically simulates smoke condition, causing the unit to alarm Press and hold test/silence button
Alarm Reset Automatic when smoke clears
Interconnections Up to 18 units of First Alert or BRK Smoke, CO and Heat Alarms. Maximum of 12 smoke alarms. See user's manual for details.
Smoke Sensor Photoelectric and Ionization
Indicator Lights/Sounds
  • AC Power: Constant Green LED
  • DC Power: Intermittent Green LED
  • Local Alarm: Red LED flashes rapidly
  • Remote Alarm: Red LED out.
  • Alarm Latch: LED flashes red 2 sec on, 2 sec off after local alarm stops
  • Low Batteru Latch: LED flashes green 2 sec on, 2 sec off
Listing Listed to UL217 Standard

BRK 3120B diagram

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