BRK SC9120BA Hardwired Smoke and CO Detector
- 120V hardwired, battery backup
- Smoke and CO combo: ionization and electrochemical sensors
- 85 decibel siren with indicator lights
- BRK and First Alert interconnect compatible
- Side load battery door, single test/silence button
- 10 oz, tamper resistant locking brackets
Updated 22 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A wired smoke and carbon monoxide alarm for replacing or adding units on an interconnected home system. Its smoke sensor is ionization only, so anyone wanting photoelectric sensing should look at another model.
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ASIN: B06Y1KCPHBModel: SC9120BCategory: Carbon Monoxide Detectors
Overview
Hallways and bedrooms in a house with hardwired alarms are where this BRK combination unit belongs. An ionization sensor watches for smoke while an electrochemical sensor detects carbon monoxide, and a backup battery covers power failures.
One unit covering both smoke and carbon monoxide, linked to compatible BRK and First Alert alarms, is the reason to install it. Smoke detection relies on an ionization sensor alone, and the listing does not name the backup battery type.
Who it's for
Houses with existing hardwired alarm circuits, especially those already running BRK or First Alert units, are its home. Renters or owners without wiring at the ceiling need a battery or plug-in model instead.
Pros and cons
- Smoke and CO sensing in one unit
- Battery backup during power failures
- Links with compatible BRK and First Alert
- Single test/silence button
- Ionization only, no photoelectric smoke sensor
- Backup battery type not listed
- Requires existing house wiring
Performance notes
Detection relies on two separate sensors, an ionization chamber for smoke and an electrochemical sensor for carbon monoxide, each triggering the same siren and indicator lights. On an interconnected circuit, one alarm sounding sets off every compatible unit. During a power outage the backup battery takes over monitoring.
Specifications
| Brand | BRK |
|---|---|
| Model | SC9120B |
Frequently asked questions
Is the BRK SC9120BA a battery-only or plug-in alarm?
No. It is a 120V hardwired alarm; the battery is a backup for power failures, not the main power source.
Will the BRK SC9120BA link with my existing First Alert alarms?
BRK says it connects to other compatible BRK or First Alert detectors so all alarms sound together. Confirm your existing units are listed as compatible.
What battery does the BRK SC9120BA use?
The listing does not name the backup battery type. Check the BRK manual before buying a spare.
How do I silence the BRK SC9120BA?
Press the single test/silence button on the unit, which also runs the alarm test.