Ajax FireProtect Plus Front View FR421B
Ajax FireProtect Plus Front View FR421B
Ajax FireProtect Plus 3-Way View FR421B
Ajax FireProtect Plus Indoor Application View FR421B
Indoor Application View FR421B

Ajax FireProtect Plus Black

R 2,369.00 Incl. VAT
R 0.00 Incl. VAT

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


Spec Data Sheet Button

The Ajax FireProtect Plus Black with a built-in carbon oxide detector is a wireless fire detector with temperature and carbon oxide sensors that monitors security in the room twenty-four hours a day and immediately notifies of dangerous CO levels, smoke and sharp jumps in temperature.

Please note: FireProtect Plus operates within the Ajax system, connected to the hub via the protected Jeweller protocol.

Compatibile with All Ajax hubs, range extenders, ocBridge Plus, uartBridge.

Product Code: 8218.16.BL1


  • Wireless indoor fire detector equipped with a siren
  • Built-in battery (lasts up to 4 years)
  • Detects the presence of smoke in the room or a sharp increase in temperature and reacts to dangerous levels of carbon monoxide
  • Communication range of 1300m (in an open space/line of sight)
  • Tampering resistant
  • Can work autonomously using Ajax ocBridge Plus and Ajax uartBridge receivers and a smart Hub control panel
  • It can operate independently from Ajax Hub, notifying of danger by means of a built-in siren (85dB)
  • The device independently tests the smoke chamber and gives prompt notification of the need to dust
  • 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)
  • Quick and Easy installation



The Ajax FireProtect Plus 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 All Ajax hubs, range extenders, ocBridge Plus, uartBridge
Classification Radio channel smoke detector with temperature sensor and built-in siren
Type of detector Wireless
Installation method Indoors
Sensing element Photoelectric, CO and temperature sensors
Alarm signal delivery time 0.15 s
Activation threshold +59°С ±2°С
Type of notification Sound/light
Volume of built-in siren 85 dB
False alarm filter Yes
Interconnected alarms Yes
Power supply 2 x CR2 batteries, 3V (Backup power supply: battery CR2032)
Battery life Up to 4 years
Communication range with central unit Up to 1,300 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 12−300 s
Additional temperature sensor Available
Operating temperature range From 0°С to +65°С
Permissible humidity Up to 80%
Protection against fraud Yes
Jamming detection Yes
Tamper-resistant Yes
Remote setting and testing Yes
Certification EN 14604
Product Dimensions 132 mm х 132 mm × 31 mm
Product Weight 220g
Packaging Dimensions 165 mm x 162 mm x 36 mm
Mass of unit packed 500g
Warranty 24 months limited Manufacturer’s warranty. The warranty does not cover batteries.



1 x Ajax FireProtect Plus Black






    Drop element here!