The Ajax FireProtect 2 RB (Heat/Smoke) Jeweller White is a wireless combined smoke and heat detector with replaceable batteries and a built-in 85 dB siren. Combining a dual-spectrum optical smoke sensor with a Class A1R heat sensor, HazeFlow 2 false-alarm filtering and encrypted Jeweller communication, it delivers reliable fire detection with up to seven years of battery life for residential and commercial installations.
Ajax FireProtect 2 RB (Heat/Smoke) Jeweller White Wireless Smoke & Heat Detector with Replaceable Batteries
The Ajax FireProtect 2 RB (Heat/Smoke) Jeweller is a wireless combined fire detector (model FP2.RBHS.J) that detects both smoke and dangerous temperature rise. The "RB" designation indicates this model uses replaceable CR123A batteries, offering easy long-term maintenance and up to seven years of battery life without the need for mains wiring.
It combines a dual-spectrum optical smoke sensor with a Class A1R heat sensor and Ajax's HazeFlow 2 filtering algorithm to accurately identify fire while minimising false alarms from steam and cooking fumes. Alarm data is transmitted to the Ajax hub over the secure Jeweller radio protocol, and a built-in siren provides immediate local warning.
Replaceable Batteries with Long Life
The detector is powered by two replaceable CR123A batteries, providing up to seven years of operation. Unlike mains-powered models, it requires no wiring and can be installed anywhere, with simple battery replacement when required.
Dual-Spectrum Optical Smoke Detection
The detector identifies smoke using a dual-spectrum optical sensor that assesses the size of airborne particles. The patented smoke chamber shields the sensor from dust, dirt and insects and does not react to water vapour, while the HazeFlow 2 algorithm reduces false alarms from steam and cooking fumes.
Class A1R Heat Detection
A Class A1R heat sensor (per EN 54-5 and BS 5446-2) monitors temperature and rate of rise. A high-temperature alarm triggers above 64°C, and a temperature-spike alarm activates when the temperature rises by more than 10°C within one minute.
Built-In Siren and LED Indication
An integrated 85 dB siren provides an immediate local audible warning, and LED indication shows green for power, yellow for malfunction and red for fire alarm. Multiple FireProtect 2 detectors can sound a coordinated interconnected alarm across the system.
Secure Jeweller Wireless Communication
The detector communicates with the Ajax hub using the encrypted, two-way Jeweller radio protocol, with a range of up to 1,700 metres in open space, with frequency hopping, device authentication and block encryption.
Interconnected Fire Alarm
When one detector raises the alarm, the hub triggers all interconnected FireProtect 2 detectors. If the hub is unavailable, detectors fall back to direct detector-to-detector interconnection, ensuring the whole premises is warned.
Tamper and Sabotage Protection
A built-in tamper alerts the system to any attempt to detach the detector or remove it from its mounting panel, and device authentication protects against spoofing.
Quick Professional Installation
The included SmartBracket mounting panel enables straightforward installation and allows the detector position to be adjusted after mounting. The device is designed for indoor use only.
KEY BENEFITS
- Replaceable batteries with up to seven years of life
- No mains wiring required — install anywhere
- Detects both smoke and dangerous heat in one device
- Dual-spectrum optical smoke sensor with HazeFlow 2 filtering
- Reduced false alarms from steam and cooking fumes
- Class A1R heat sensor with rate-of-rise detection
- Built-in 85 dB siren for immediate local warning
- Interconnected alarm across all FireProtect 2 detectors
- Encrypted Jeweller wireless communication up to 1,700 m
- Tamper protection against removal
- SmartBracket enables fast installation with post-fit adjustment
- Available in White finish
- Suitable for residential and commercial installations
KEY FEATURES
- Wireless smoke and heat detector with replaceable batteries
- 2 × replaceable CR123A batteries
- Battery life up to 7 years
- Dual-spectrum optical smoke sensor
- HazeFlow 2 false-alarm filtering
- Class A1R heat sensor (EN 54-5 / BS 5446-2)
- High-temperature alarm above 64°C
- Temperature-spike alarm at 10°C/minute rise
- Built-in 85 dB siren
- LED indication (green / yellow / red)
- Interconnected fire alarm support
- Secure Jeweller two-way wireless protocol
- Communication range up to 1,700 m in open space
- Tamper protection
- SmartBracket mounting panel
- Certified to EN 14604
- IP20 protection rating
- Indoor installation only
- White finish
IDEAL FOR
- Homes and apartments
- Offices and commercial premises
- Hotels and hospitality venues
- Retail shops
- Properties without convenient mains wiring for detectors
- Hallways, landings and living areas
- Installations requiring flexible battery-powered detection
- Professional Ajax fire and security systems
SYSTEM COMPATIBILITY
- Compatible with Ajax Hub 2 (2G)
- Compatible with Ajax Hub 2 (4G)
- Compatible with Ajax Hub 2 Plus
- Compatible with Ajax Hub Hybrid (2G)
- Compatible with Ajax Hub Hybrid (4G)
- Compatible with Ajax ReX 2 range extender
- Uses Ajax Jeweller encrypted wireless communication
- Managed via Ajax mobile applications (iOS and Android)
- Managed via Ajax desktop applications (Windows and macOS)
- Supports Ajax Cloud remote management
- Supports Over-the-Air (OTA) firmware updates
| Specification |
Details |
| Brand |
Ajax |
| Model |
FireProtect 2 RB (Heat/Smoke) Jeweller |
| Article Number |
52250.136.WH1 |
| Device Model Code |
FP2.RBHS.J |
| Product Type |
Wireless Smoke & Heat Detector with Replaceable Batteries |
| Product Line |
FireProtect 2 |
| Smoke Detection |
Dual-Spectrum Optical Sensor |
| Heat Detection |
Class A1R Thermistor |
| High-Temperature Alarm |
Above 64°C |
| Temperature-Spike Alarm |
10°C rise in 1 minute |
| False Alarm Prevention |
HazeFlow 2 |
| Built-In Siren |
85 dB at 3 m |
| Power Supply |
2 × CR123A (Replaceable) |
| Battery Life |
Up to 7 Years |
| LED Indication |
Yes (green / yellow / red) |
| Interconnected Alarm |
Yes |
| Wireless Technology |
Jeweller |
| Radio Communication Range |
Up to 1,700 m (open space) |
| Tamper Protection |
Yes |
| Certification |
EN 14604 |
| Protection Rating |
IP20 |
| Operating Temperature |
0°C to +50°C |
| Operating Humidity |
Up to 80% Non-condensing |
| Dimensions |
124 × 124 × 45 mm |
| Weight |
272 g |
| Colour |
White |
| Material |
High-quality Plastic |
| Mounting |
SmartBracket Mounting Panel |
| Indoor / Outdoor |
Indoor Use Only |
| Warranty |
24 Months |
FREQUENTLY ASKED QUESTIONS (FAQs)
What is the Ajax FireProtect 2 RB (Heat/Smoke) Jeweller used for?
It is a wireless fire detector that detects both smoke and dangerous heat, with a built-in 85 dB siren. It runs on replaceable batteries with up to seven years of life and communicates with the Ajax hub over the secure Jeweller protocol.
What does the "RB" mean in FireProtect 2 RB?
"RB" stands for replaceable batteries. This model is powered by two replaceable CR123A batteries, whereas the "AC" version is mains-powered. RB requires no wiring and offers up to seven years of battery life.
Does it detect both smoke and heat?
Yes. It combines a dual-spectrum optical smoke sensor with a Class A1R heat sensor, detecting both smoke and dangerous temperature rise in a single device.
How long do the batteries last?
The two replaceable CR123A batteries provide up to seven years of operation under normal conditions, and battery status is monitored and reported in the Ajax app.
How does it reduce false alarms?
The dual-spectrum optical sensor assesses particle size, the patented smoke chamber is shielded from dust and insects and does not react to water vapour, and the HazeFlow 2 algorithm filters out steam and cooking fumes.
Can it be installed outdoors?
No. The FireProtect 2 RB (Heat/Smoke) Jeweller is designed for indoor use only and carries an IP20 rating.
What colour options are available?
This product (article 52250.136.WH1) is the White version. A Black variant is also available under a separate article number.
