Introducing the Revolutionary 9120B AC Powered Smoke Alarm with battery back-up, silence, latching and Perfect Mount system. This device, along with the rest of the 9120 series, has been redesigned from the ground up. They install faster, perform better and are even smarter than before. All of these improvements help reduce nuisance alarms, save you time and money, and provide years of virtually maintenance-free service. The 9120B meets codes where an AC smoke alarm with battery back-up is required. All devices in the 9120 series provide the following features:
- Meet UL 217 standard - single and multiple station smoke alarm.
- Listed with California State Fire Marshal.
- New UL mandated repeating alarm horn pattern (85 dB)-3 beeps, pause, 3 beeps.
- New 10-Year Limited Warranty.
- Large, easy to install mounting bracket fits most boxes.
- Interconnectable (With maximum 18 compatible devices). Can be interconnected with up to 12 smoke alarms and the remaining six be a combination of UL listed BRK heat alarms and RM3 relays. Smoke and CO alarms must be interconnected separately per NFPA 72 and UL 217.
- "Quick Connect" pigtail - locks into place.
- Protective screen around sensor chamber
Product Features
   |
| Features |
| Ionization Sensor |
| I 120V AC; Interconnectable |
| Battery back-up |
| Latching Alarm Indicator |
| Smart Technology |
| Single Button Test/Silence |
| Perfect Mount System |
| Mounting bracket lock |
| Battery Drawer lock |
| Battery pull tab |
| Side load battery drawer |
| Dust Cover |
| 9V Battery Included |
| 10-Year Limited Warranty |
BRK 4120 Series to 9120 Series Cross Reference Chart
| Old Model No. | New Model No. | Description |
| 4120 | 9120 | AC BRK Smoke |
| 4120-12ST | 9120-12ST | AC BRK Smoke in 12-pack Stadium Tray |
| 4120 | 9120 | AC BRK Smoke |
| 4120AB | 9120AB | AC/DC BRK Smoke w/Alkaline Battery |
| 4120B | 9120B | AC/DC BRK Smoke (includes silence) |
| 4120B-48B | 9120B-48B | AC/DC BRK Smoke 48 bulk pack |
| 4120B-48P | 9120B-48P | AC/DC BRK Smoke 48 pack |
| 4120B-GFD | 9120B-GFD | AC/DC BRK Smoke Gravity Feed Display |
| 4120LB | 9120LB | AC/DC BRK Smoke w/Lithium Battery |
| 4120SAB | Obsolete | Not needed-Silence is a standard feature |
| 4120SB | Obsolete | Not needed-Silence is a standard feature |
| 4120SB-12ST | 9120B-12ST | AC/DC BRK Smoke 12 pack Stadium Tray |
| 4120SB2 | Obsolete | AC/DC BRK Smoke 2 pack-Retail |
| 4120SB-48B | Obsolete | Not needed-Silence is a standard feature |
| 41206CP | 91206CP | AC BRK Smoke Contractor bulk 6-pack |
| 4120SB6CP | 9120B6CP | AC/DC BRK Smoke Contractor bulk 6-pack |
| 4120SB-GFD | Obsolete | Not needed-Silence is a standard feature |
| 4919A | 9120A | AC BRK Smoke Canada |
| 8120BL | Obsolete | Not needed. Latching is a standard feature. |
| SA4120B-48B | SA9120B-48B | AC/DC First Alert Smoke 48 bulk pack |
| SA4120CN | Obsolete | AC First Alert Smoke-clamshell |
| SA4121B-48B | Obsolete | Not needed-Silence is a standard feature |
| SA4121CN | SA9121CN | AC/DC First Alert Smoke-clamshell 3-pack |
| SC6120B | SC9120B | AC/DC BRK Smoke/CO combo |
| None | SC9120B-GFD | AC/DC BRK Smoke/CO Gravity Feed Display |
| None | SC9120BA | AC/DC BRK Smoke/CO combo-Canada |
| SC6120B-12ST | SC9120B-12ST | AC/DC BRK Smoke/CO combo-12-pack stadium tray |
| SA4121CN3 | Obsolete | Replaced by SA9121CN |