Model # 9120B

Internet #100065881

BRK Hardwired Interconnected Smoke Alarm with Battery Backup
0029054513014

BRK

Hardwired Interconnected Smoke Alarm with Battery Backup

  • Ionization smoke sensor
  • Tamper resistant locking pins
  • Hardwired with battery backup
$1221 /each
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Product Overview

The BRK 9120B 120-Volt AC Smoke Alarm with Battery Backup is designed to install faster, perform better, and be even smarter than before. This alarm is 120-Volt AC inter-connectable (with maximum 18 compatible devices), which lets the alarm be interconnected with up to 12 other compatible smoke alarms and six compatible devices like bells, horns, repeaters, and door closers to network a comprehensive system for your home. If one unit triggers an alarm, all smoke alarms in the series will sound. The 9120B includes an ionization sensor which helps detect fast flaming fires that consume combustible materials rapidly. The dust-reducing packaging helps avoid accidental alarms due to contaminants and the 85 dB horn can be inspected with a test button. This unit includes a quick-connect wiring harness for easier installation to your household current and 9-Volt battery backup ensures protection even during power outages or service interruptions. 10-year limited warranty.

  • 120V AC smoke alarm with battery backup
  • 85 dB horn sounds as smoke reaches dangerous levels
  • Can be interconnected with 12 additional BRK and First Alert smoke alarms and 6 compatible devices such as heat alarms for a complete safety system
  • Dust-blocking covers to reduce nuisance alarms associated with particulate contamination
  • Locking pins deter removal
  • A single button tests units functionality and silences nuisance alarms
  • 9-Volt battery backup ensures operation during household current interruption
  • Power indicator lets you see at a glance that the alarm is powered
  • Universal mounting bracket with wide opening for easy wire access
  • Meets UL standards

Info & Guides

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Price
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Name Hardwired Interconnected Smoke Alarm with Battery Backup FireX Hardwired 120-Volt Inter-Connectable Smoke Alarm with Battery Backup Hardwired 120-Volt Inter-Connectable Smoke Alarm With Battery Backup Includes Universal Adapters Hardwired Interconnected Smoke Alarm with Battery Backup
Brand BRK Kidde Kidde First Alert
Ratings (188) (347) (337) (41)
Power Source Hardwired Hardwired Hardwired Hardwired
Alarm Sensor Type Ionization Ionization Ionization Photoelectric
Alarm/Detector Features No Additional Features Battery Back-Up,Hush Feature,Interconnected Battery Back-Up,Hush Feature,Interconnected Battery Back-Up
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Customer Questions & Answers

I need a replacement for BRK 4120B

I need to replace a BRK Model No. 4120B, What new Model number do I need to replace it with?
Asked by: r2mays
BRK Electronics says that model 9120B is the replacement for the discontinued 4120B.
Answered by: Rick
Date published: 2017-06-10

How to clean?

Cleaning
Asked by: Brk
The instructions say to dust them once a month and to never use any water or liquid cleaner on them.
Answered by: Nate
Date published: 2016-12-30

can I buy without battery back up

the ceilings are very high, we have a generator back u, we don't want battery back up can I still get smokes without battery backup?
Asked by: bob
Don't see any satisfactory answers here. I have the same problem. 10 smoke detectors in the house and one that needs a 30 ft ladder to change the battery. I just wnat one that doesn't have to be serviced every year! I know they were available but where can I find one now?
Answered by: tomg
Date published: 2017-02-24

How difficult is it to replace the mounting bracket? Is is just a matter of removing the two obv...

How difficult is it to replace the mounting bracket? Is is just a matter of removing the two obvious screws at the front of the bracket, or do you have to do anything in the box where the wires are?
Asked by: Rick
We had no difficulty at all with the installation. It was just a matter of disconnecting the wires of the old one and connecting the wires of the new one. We didn't even need to remove the bracket. Hope it is as easy for you.
Answered by: indybarb
Date published: 2017-04-20
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Customer Reviews

Hardwired Interconnected Smoke Alarm with Battery Backup is rated 4.5 out of 5 by 188.
Rated 2 out of 5 by from Three different times now the low battery alarm has gone off for no reason, in the middle of the ... Three different times now the low battery alarm has gone off for no reason, in the middle of the night. I have pulled all batteries and they tested good with a full 9volts with voltmeter. Reinstalled the batteries, and pushed test button to reset, and all is temporarily okay. Real fun getting up in the middle of the night to problem shoot a faulty piece of equipment.
Date published: 2017-03-22
Rated 4 out of 5 by from Easy to install to existing bracket as a replacement for... Easy to install to existing bracket as a replacement for one that "aged out."
Date published: 2017-03-14
Rated 5 out of 5 by from We had an off duty fireman in our house to clean our dryer vent. He asked how old our smoke dete... We had an off duty fireman in our house to clean our dryer vent. He asked how old our smoke detectors were. They were original to the house. Model BRK 4120B. The 9120B uses the same plug. It was easy to install. The paperwork recommends shutting off power to the circuit your unit is attached to. I didn't do that. The old trim ring is held on by 2 screws. Just back them off enough to get the old trim ring removed. It takes a little work to get the screws to line up, but once you do, tighten the trim ring to the ceiling, pull the plastic battery protector out, plug the unit into the ceiling, and screw on to the mounting. Five minute job. Thank you First Alert for making it easy!
Date published: 2017-05-06
Rated 5 out of 5 by from Purchased this a replacement for one of three units in my condo which failed after nearly four ye... Purchased this a replacement for one of three units in my condo which failed after nearly four years; I was ineligible for warranty as the units were installed by the home builder before purchase. Really like the product and feel safe with the system in my home. I appreciate the feature of having all units sounding off if just one unit detects an unsafe situation. I would probably have chosen this very product if given the choice when my building was under construction. Very pleased with the selling price for the replacement.
Date published: 2017-01-31
Rated 5 out of 5 by from We had the hardwired smoke alarms. We just needed replacements as our others were 7 yrs old and w... We had the hardwired smoke alarms. We just needed replacements as our others were 7 yrs old and wore out. The new ones are awesome and work GREAT !! Thank you so much. Karin L.I can't add photo, but I hope I can still WIN !! My product is in full action. and we love them. Thanks Home Depot, your the best. We got them in 4 days, after ordering.
Date published: 2017-03-09
Rated 2 out of 5 by from iT IS VERY SENSITIVE. AFTER COOKING SOMETING IN MY OVEN AND I OPEN THE DOOR TO GET FOOD OUT THE ... iT IS VERY SENSITIVE. AFTER COOKING SOMETING IN MY OVEN AND I OPEN THE DOOR TO GET FOOD OUT THE ALARM WILL GO OFF. IT IS PLACED ABOVE A DOOR AND THE CEILING IS A VERY HIGH CEILING. IT IS VERY ANOYING BECAUSE IT IS TOO SENSITIVE.
Date published: 2017-02-01
Rated 5 out of 5 by from BRK Smoke Alarms Was a direct replacement for my 15 year old detectors, so it was just plug-and-play. Replaced the old bezels since they had yellowed, which only required loosening two screws and re-tightening with the new bezels.
Date published: 2017-07-11
Rated 5 out of 5 by from Great Replacement- I'm pleased :) I purchased these to replace the ones installed by the builder. They are great and totally compatible. Thanks Home Depot for offering the product and for the reasonable price and fast shipping.
Date published: 2017-05-30
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