Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White Front View FR423W
Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White Front View FR423W
Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White 3-Way View FR423W
Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White Side Angle View FR423W
Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White Indoor Application 1 View FR423W
Ajax FireProtect 2 RB (HEAT/SMOKE/CO) White Indoor Application 2 View FR423W
Indoor Application 3 View FR423W
App Controlled FR423W

Ajax FireProtect 2 RB (Heat/Smoke/CO) White

R 3,027.00 Incl. VAT

Available to order online or collect at 6 Cosmic Street Linbro Park, Sandton, 2090 (Map)


Spec Data Sheet Button 

The Ajax FireProtect 2 RB (Heat/Smoke/CO) is a next-gen indoor wireless fire and carbon monoxide detector with heat, smoke and CO sensors designed for residential fire safety.

Equipped with a siren (piezoelectric buzzer) for sound notification of alarms and events with a volume of up to 85 dB (at a distance of 3m from the detector).

FireProtect 2 detects smoke with a bispectral optical sensor that allows the detector to determine the size of the volatile particles inside the chamber and respond only to smoke, ignoring vapour and steam.

Two built-in class A1R thermistors notify of alarms when a rapid temperature rise or static temperature is detected in the range of +54°C to +65°C and the smoke chamber is also protected from dust, dirt, and insects.

Carbon monoxide (CO) is colorless, odorless, and otherwise imperceptible without a carbon monoxide detector. FireProtect 2 warns about a dangerous CO concentration at the level of 50 ppm before even the first signs of poisoning occur.

The Ajax automation devices can respond to FireProtect 2 alarms and perform user-defined actions using automation scenarios. For example, the WallSwitch relay can turn off the ventilation system and turn on emergency lighting when an alarm occurs.

The FireProtect 2 detector operates as part of the Ajax system, communicating with the hub via the Jeweller secure radio protocol but can also be used autonomously without connecting to an Ajax hub. In this case, the detector notifies of fire or smoke with only a built-in siren and LED indication.

Users don’t receive notifications on any Ajax apps, including Ajax Translator, or PRO Desktop. The Interconnected Fire Detectors Alarms feature is also unavailable for this operation mode.

Compatible with Hub Plus, Hub 2, Hub 2 Plus, Hub Hybrid, ReX and ReX 2 (OS Malevich 2.14.1 and higher).

Product Code: 43378.137.WH1


  • Wireless indoor fire and carbon monoxide detector with an 85dB Siren
  • Built-in battery (lasts up to 7 years)
  • Communication range of up to 1700m without obstacles
  • Coverage area is 50 to 60 m², depending on the type of premises
  • Patented smoke chamber technology
  • Impenetrable for dust and insects
  • Smoke chamber does not require regular cleaning
  • Ignores сooking fumes and water steam
  • Equipped with two class A1R thermistors to detect smokeless fire threats
  • Built-in chemical sensor which detects Carbon Monoxide
  • HazeFlow 2 software algorithm also protects against false alarms
  • Protected by two tampers
  • Detector is set up via the Ajax app for iOS, Android, macOS and Windows
  • System notifications delivered via push notifications, SMS and calls (if activated)
  • Always active and reacts to a fire 24/7
  • Quick and Easy installation



The Ajax FireProtect 2 RB (Heat/Smoke/CO) detector comes ready to operate straight out the box.

The battery is pre-installed, so there is no need to disassemble the detector.

With one click, it can be connected to the hub in the mobile application. It can be mounted on the SmartBracket in just a few minutes.


Compatibility Hub Plus, Hub 2, Hub 2 Plus, Hub Hybrid, ReX and ReX 2 (OS Malevich 2.14.1 and higher)
Classification Radio channel smoke detector with temperature sensor and built-in siren
Type of detector Wireless
Installation method Indoors
Sensing element Smoke, Heat and Chemical CO (Carbon Monoxide) sensor
Alarm signal delivery time 0.15 s
High temperature alarm Temperatures above 64°C
Temperature spike alarm When the temperature rises more than 10°C in 1 minute or less

CO Detection

More than 50 ppm (0.005%) — no more than in 90 minutes
More than 100 ppm (0.01%) — no more than in 40 minutes
More than 300 ppm (0.03%) — no more than in 3 minutes
CO concentration of 400 ppm (0.04%) within 3 hours can be life-threatening. The detector stops notifying about the dangerous level of carbon monoxide when the concentration drops to 50 ppm (0.005%) within one minute
Type of notification Sound/light
Volume of built-in siren 85 dB
False alarm filter Yes
Interconnected alarms Yes
Power supply 2 x CR123A batteries
Battery life Up to 7 years
Communication range with central unit Up to 1700 m in an open space
Two-way communication between devices Yes
Operating frequencies 868.0-868.6 MHz
Self-adjusting RF output power Up to 20 mW
Block encryption based on AES algorithm Yes
Detector polling period 12 – 300s
Operating temperature range From 0°С to +50°С
Permissible humidity Up to 80%
Protection Class IP20
Protection against fraud Yes
Jamming detection Yes
Tamper-resistant Yes
Remote setting and testing Yes
Certification CE, EN 14604:2005/AC:2008, EN 50291-1:2018, Qmark
Product Dimensions 124 mm х 124 mm × 45 mm
Product Weight 272g
Packaging Dimensions 175 mm x 175 mm x 70 mm
Mass of unit packed 500g
Warranty 24 months limited Manufacturer’s warranty. The warranty does not cover batteries.



1 x Ajax FireProtect 2 RB (Heat/Smoke/CO) Detector








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