The BRK SC9120BA Hardwired Smoke and Carbon Monoxide Alarm combines smoke and CO detection in one 120V direct-wire unit with a 9V battery backup. The battery backup keeps the alarm protecting your home if building power fails temporarily.
Designed with an ionization smoke sensor for fast-flaming fires and an electrochemical carbon monoxide sensor, the SC9120BA interconnects with up to 12 compatible smoke alarms and up to 6 compatible smoke/CO combination alarms. When one interconnected alarm is triggered, all connected units sound to provide an early warning throughout the property.
Indicator lights on the face of the unit show whether smoke or carbon monoxide has been detected, while an 85-decibel siren provides a clear, loud warning. The alarm also features an alarm latch, low-battery latch, 10-year end-of-life warning and a single test/silence button.
Key Features
- 120V direct-wire hardwired smoke and carbon monoxide combination alarm
- Ionization smoke sensing technology
- Electrochemical carbon monoxide sensor
- 9V battery backup (battery included)
- Battery backup maintains protection during power outages
- Interconnects with up to 12 smoke alarms and up to 6 smoke/CO combination alarms
- Separate indicator lights for smoke and carbon monoxide
- 85 dB alarm
- Alarm latch and low-battery latch
- 10-year end-of-life warning
- Single test/silence button
- Front-load battery compartment
- Tamper-resistant locking and universal mounting brackets
Technical Specifications
- Manufacturer: BRK / First Alert
- Model: SC9120BA (BRK #1044368)
- Product Type: Hardwired Smoke & Carbon Monoxide Alarm
- Primary Power: 120V direct wire
- Backup Battery: 9V (included)
- Smoke Sensor: Ionization
- CO Sensor: Electrochemical
- Interconnection: Hardwired interconnection
- Alarm Volume: 85 dB
- Hush / Silence Feature: Yes
- End-of-Life Warning: Yes (10 years)
- Voice Alerts: No
- Dimensions: 5.6 in x 5.6 in x 2 in
- Colour: White
Ideal for hardwired residential smoke and CO alarm installations, including:
- Single-family homes
- Condominiums
- Apartments
- Multi-residential properties
- Bedrooms and hallways
- Areas near fuel-burning appliances and attached garages
- Residential retrofit and replacement applications
- New installations requiring hardwired interconnected smoke/CO alarms




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