Product Description
SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup by BRK (First Alert) is a 120V AC, direct-wire smoke alarm with a monitored 9V battery backup for continued protection during power outages. An ionization sensing chamber, one-touch Test/Silence, and a latching alarm indicator make it a reliable choice for code-compliant residential and light-commercial applications.
- Power: 120V AC hardwire with monitored 9V battery backup
- Sensor: Ionization sensing chamber
- Interconnect: Link up to 18 total alarms (max 12 smoke)
- Sounder: 85 dB at 10 ft piezo horn
- Status & Safety: Latching alarm indicator; Test/Silence button; LED power/alarm status
- Operating range: 40°F to 100°F; 10–95% RH
- Size & Weight: 5.58" diameter × 1.99" H; 0.47 lb
- Listing: UL 217; designed to install per NFPA 70 & 72
- Warranty: 10-year limited warranty
- Free shipping on orders over $250
Benefits
- Whole-home notification: Interconnect capability triggers all compatible alarms so alerts are heard throughout the space.
- Protection during outages: Monitored 9V battery backup keeps the alarm active when utility power is lost.
- Fast, simple installation: Perfect Mount bracket and plug-in connector speed alignment and wiring.
- Easy troubleshooting: Latching indicator identifies the unit that initiated the alarm or low-battery condition.
Key Features
- Ionization sensing for detection of fast-flaming fires.
- One-touch Test/Silence electronically simulates smoke to verify all alarm functions and lets you hush nuisance alarms.
- LED status & patterns: AC power (constant green), DC power (green flash), alarm (3 beeps + red flash), low battery, malfunction, and end-of-life chirps.
- Tamper-resistant locks secure the battery drawer and alarm to the mounting bracket.
- Dust cover included to keep the unit clean during construction.
Specifications
Technical Specs
| Input Voltage | 120V AC, 60 Hz |
| Backup Battery | 9V Carbon Zinc (monitored) |
| Sensor Type | Ionization |
| Test/Silence | One-touch button electronically simulates smoke condition |
| Alarm Reset | Automatic when smoke clears |
| Interconnect | Up to 18 total BRK/First Alert alarms; maximum 12 smoke alarms |
| Wiring (interconnect) | Use 300V-rated conductor; max run 1000 ft (per instructions and codes) |
Performance Specs
| Sound Output | 85 dB at 10 ft |
| LED/Chirp Patterns | Power (green on/flash), Alarm (3 beeps + red flash), Latching (red 2s on/2s off), Low Battery (1 chirp/min), Malfunction (3 chirps/min), End of Life (5 chirps/min) |
| Operating Temp | 40°F (4°C) to 100°F (38°C) |
| Humidity Range | 10% to 95% RH (non-condensing) |
Physical Specs
| Dimensions | 5.58" Dia. × 1.99" H |
| Weight | 0.47 lb |
| Mounting | Perfect Mount bracket; gasketless base; plug-in connector |
| Included | Dust cover; locking pins (battery drawer & bracket) |
Compliance & Safety
| Standards | UL 217 listed; reference NFPA 70 (NEC) & NFPA 72 for installation |
| Code Notes | Interconnect compatible with most BRK and First Alert smoke, CO, and heat alarms |
| Agency/Model Notes | Manufactured by Resideo Technologies, Inc. and affiliates |
| Warranty | 10-year limited warranty |
Application Examples
- Bedrooms, hallways, and living areas in single-family residences
- Multi-family corridors and dwelling units
- Small offices, classrooms, and light-commercial occupancies where local code permits
- Projects needing interlinked alarms for broader coverage
Installation Tips
- Power OFF before wiring; installation should be performed by a qualified electrician following NFPA 70 and NFPA 72 and the authority having jurisdiction.
- Use the Perfect Mount bracket to secure and align the alarm; the plug-in connector simplifies wiring.
- When interconnecting, limit the run to 1000 ft and use conductors rated at 300V; connect only compatible BRK/First Alert units.
- After installation, press Test/Silence to verify operation; the latching indicator will identify the initiating unit after an alarm.
- Do not paint the alarm; keep dust cover on until construction is complete.
Frequently Asked Questions
Q: What type of smoke detection does the SMI100-AC use?
A: It uses an ionization sensing chamber designed to detect fast-flaming fires.
Q: Can I interconnect this with other alarms?
A: Yes. You can connect up to 18 total BRK/First Alert devices (maximum 12 smoke alarms) so all sound when any one detects smoke.
Q: How loud is the alarm?
A: The built-in piezo horn produces 85 dB at 10 feet.
Q: What happens during a power outage?
A: The monitored 9V battery backup continues to power the unit so protection isn’t interrupted.
Q: What do the indicator lights and chirps mean?
A: AC power shows constant green; DC backup flashes green; alarm gives 3 beeps with red flash; distinct chirp patterns indicate low battery, malfunction, or end of life.
Q: How do I silence a nuisance alarm?
A: Press the Test/Silence button to temporarily hush the alarm; it will continue to monitor for smoke.
Q: Is the battery drawer tamper resistant?
A: Yes. Locking features can secure the battery drawer and lock the alarm to the mounting bracket.
Q: What are the operating conditions?
A: 40°F to 100°F and 10–95% relative humidity (non-condensing).
