BRK SC9120BA Hardwired Smoke & CO Alarm with 9V Battery Backup
MFR Part #:SC9120BA
- Alarm Type :Audible
- Power Source :120V AC, 60 Hz
- Audible Alert :85 dB at 10 ft
- Sensor Type :Electrochemical/Ionization
- Humidity Rating :10 to 95%
- Color :White
The BRK SC9120BA is a hardwired smoke and carbon monoxide combination alarm with battery backup, designed for residential and multi-family installations. It uses dual-sensor detection and supports interconnection for whole-home protection in code-compliant systems.
- BRK® SC9120BA Combination Smoke and Carbon Monoxide Alarm, 10 ft Detection, Electrochemical/Ionization Sensor, 120 VAC, 85 dB
Dual Sensor Detection (Ionization + Electrochemical CO)
- Detects both fast-flaming fires and carbon monoxide using dedicated sensing technologies for broader hazard coverage.
120V Hardwired with 9V Battery Backup
- Maintains continuous protection during power outages without system interruption.
Interconnectable with Up to 18 Devices (12 Smoke Max)
- Enables whole-property alerting—when one alarm triggers, all interconnected units sound.
Latching Alarm Indicator
- Identifies which unit initiated the alarm, reducing troubleshooting time in multi-unit systems.
Silence Feature (Alarm & Low Battery)
- Allows temporary silencing of nuisance alarms or low battery chirps without disabling protection.
10-Year CO Sensor & End-of-Life Signal
- Provides long-term CO detection with clear notification when replacement is required.
85 dB Audible Alarm
- Ensures alerts are clearly heard throughout the protected area.
Quick-Connect Wiring Harness & Mounting System
- Simplifies installation with secure alignment and reduced installation time.
Tamper-Resistant Locking Features
- Helps prevent battery removal or theft of the unit in shared environments.
Intelligent Sensing Technology
- Reduces nuisance alarms while maintaining reliable detection performance.
Specification
Details
Model
BRK SC9120BA
Power Source
120V AC, 60Hz hardwired + 9V battery backup
Sensors
Ionization smoke sensor + electrochemical CO sensor
Alarm Output
85 dB at 10 ft
Interconnectivity
Up to 18 units (max 12 smoke alarms)
Operating Current
0.09 amps (standby/alarm)
Temperature Range
40°F to 100°F (4°C to 38°C)
Humidity Range
10% to 95% RH
Dimensions
5.6 inch diameter × 2.0 inch height
Weight
8.5 oz
Indicator Lights
Green (AC/DC power), Red (alarm/latch status)
CO Alarm Thresholds
70 PPM (60–240 min), 150 PPM (10–50 min), 400 PPM (4–15 min)
Standards Compliance
ULC S531, CSA 6.19-01, NFPA 72 & 720, ICC
Alarm Reset
Automatic when condition clears
Residential Homes
- Suitable for bedrooms, hallways, and living spaces requiring combined smoke and CO detection.
Multi-Family Housing
- Ideal for apartments, condos, and duplexes with interconnected alarm requirements.
Institutional Environments
- Approved for sleeping areas in hotels, motels, dormitories, and hospitals.
Code-Compliant Installations
- Designed to meet electrical and fire safety codes requiring AC/DC interconnected alarms.
Compatible with First Alert and BRK interconnected smoke, CO, and heat alarms
- Supports up to 18 interconnected units total - Maximum of 12 smoke alarms within the network.
Requires:
- 120V AC electrical system.
- Interconnect wiring (orange wire) between units.
What type of detection does the BRK SC9120BA use?
The BRK SC9120BA uses an ionization sensor for smoke detection and an electrochemical sensor for carbon monoxide, providing dual hazard monitoring.
Can the BRK SC9120BA operate during a power outage?
Yes. It is hardwired to 120V AC but includes a 9V battery backup to maintain operation if power is lost.
How does interconnection work with this alarm?
The unit can be interconnected with up to 18 compatible BRK or First Alert devices, ensuring all alarms sound when one detects a hazard.
What happens at the end of the alarm’s lifespan?
The unit provides an audible and visual end-of-life signal after approximately 10 years, indicating it needs replacement.
Does the BRK SC9120BA reduce nuisance alarms?
Yes. It features Intelligent Sensing Technology and a silence function that helps minimize and manage nuisance alarms without disabling protection.