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BRK Electronics First Alert 9120B-48B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Saving 48-Pack
BRK Electronics First Alert 9120B-48B 120V AC/DC Hardwired with 9V Battery Backup Ionization Smoke Alarm - Saving 48-Pack

This BRK 9120B is a recommended replacement for the following old BRK / FirstAlert models:
  • BRK 4120B
  • BRK 4120SB
  • FirstAlert SA4120B
  • FirstAlert SA4121B
  • FirstAlert SA4919B
Our Price: $474.24
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Model: BRK-9120B-48B

Technical Spec Downloads
Technical Spec

The 9120 Series smoke alarms have been designed to install faster, perform better and be even smarter than before. These improvements help reduce nuisance alarms and save you time and money.
Bulk pack contains no package carton and only 24 manuals.

  • Single button test/silence
  • 9V Battery Backup
  • Latching alarm indicator - remembers which unit initiated an alarm
  • Smart Technology - helps reduce the number of nuisance alarms
  • Perfect Mount - allows for easy alignment of alarm
  • Dust Cover
  • Easy Installation/Maintenance - Preferred features include a large opening in the mounting bracket for easy access to wiring. Keyhole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation. A battery pull tab keeps the battery fresh until the home is occupied. Battery installation and removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment. Two locking features are provided to prevent battery theft and/or theft of the unit. Connection to AC power is made with a "Quick-Connect" wiring harness. Installation is quick, easy and cost effective.
  • 10-Years Limited Warranty
Model # 9120B-48B
Weight 7.8 oz
Dimension 5.6" dia x 2.0"H
Operating Voltage 120V AC 60Hz w/ 9V battery backup
Operating Current .04 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 Dual chamber ionization
Indicator Lights/Sounds
  • AC Power: Constant Green LED
  • DC Power: Intermittent Red LED
  • Local Alarm: Red LED flashes rapidly
  • Remote Alarm: Red LED out.
  • Latching Alarm: Green LED flashes 2 sec. on/2 sec. off after local alarm
Listing Listed to UL217 Standard

BRK 9120B-48B diagram

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