The Ajax FireProtect 2 AC (Heat/Smoke) Jeweller White is a mains-powered wireless combined smoke and heat detector with a built-in 85 dB siren and non-replaceable lithium backup battery. Combining a dual-spectrum optical smoke sensor with dual Class A1R heat sensors, HazeFlow 2 false-alarm filtering and encrypted Jeweller communication, it delivers fast, reliable fire detection with continuous mains power for demanding residential and commercial installations.

Ajax FireProtect 2 AC (Heat/Smoke) Jeweller White Mains-Powered Wireless Smoke & Heat Detector

The Ajax FireProtect 2 AC (Heat/Smoke) Jeweller is a wireless combined fire detector (model FP2.ACHS.J) that detects both smoke and dangerous temperature rise, providing early warning of fire from a single device. The "AC" designation indicates this model is externally (mains) powered at 110–240 V, with a non-replaceable lithium backup battery ensuring continued operation during a power outage.

It combines an advanced dual-spectrum optical smoke sensor with two Class A1R thermistors and Ajax's HazeFlow 2 filtering algorithm to accurately identify fire while minimising false alarms from steam and cooking fumes. Alarm and event data is transmitted to the Ajax hub over the secure Jeweller radio protocol, and a built-in siren provides an immediate local audible warning.

Mains Power with Battery Backup

The detector is mains-powered at 110–240 V~ (50/60 Hz), drawing up to 2 W, making it ideal for installations that require permanently powered fire detection. A non-replaceable CR-2/3AZ lithium backup battery maintains protection during a mains failure, so the detector continues to operate and communicate even during a power outage.

Dual-Spectrum Optical Smoke Detection

The detector identifies smoke using a dual-spectrum optical sensor that assesses the size of airborne particles to distinguish genuine smoke from harmless 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 further reduces false alarms from steam and cooking fumes.

Class A1R Heat Detection

Two Class A1R thermistors (per EN 54-5 and BS 5446-2) monitor 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, providing reliable detection of fast-developing fires that may produce little smoke.

Built-In Siren and LED Indication

An integrated 85 dB siren provides an immediate local audible warning, and clear LED indication shows green for power, yellow for malfunction and red for fire alarm. When multiple FireProtect 2 detectors are installed, they 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. Jeweller provides frequency hopping, device authentication and block encryption with a dynamic key, and loss of communication is detected and reported so faults never go unnoticed.

Interconnected Fire Alarm

When one detector raises the alarm, the hub triggers all interconnected FireProtect 2 detectors within around 20 seconds. 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

• Mains-powered for permanently powered fire protection
• Non-replaceable lithium backup battery for power-outage protection
• 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
• Dual Class A1R heat sensors 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

• Mains-powered wireless smoke and heat detector
• Power supply 110–240 V~, 50/60 Hz, up to 2 W
• Non-replaceable CR-2/3AZ lithium backup battery
• Dual-spectrum optical smoke sensor
• HazeFlow 2 false-alarm filtering
• Two Class A1R thermistors (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
• Indoor installation only
• White finish

IDEAL FOR

• Homes and apartments
• Offices and commercial premises
• Hotels and hospitality venues
• Retail shops
• Rental and managed properties requiring mains-powered detection
• Hallways, landings and living areas
• Installations requiring permanently powered fire 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

FREQUENTLY ASKED QUESTIONS (FAQs)

What is the Ajax FireProtect 2 AC (Heat/Smoke) Jeweller used for?

It is a mains-powered wireless fire detector that detects both smoke and dangerous heat, providing early warning of fire with a built-in 85 dB siren. It communicates with the Ajax hub over the secure Jeweller protocol and is suitable for residential and commercial installations requiring permanently powered detection.

What does the "AC" mean in FireProtect 2 AC?

"AC" indicates the detector is externally (mains) powered at 110–240 V, with a non-replaceable lithium backup battery for continued operation during a power outage. The "RB" version, by contrast, runs on replaceable CR123A batteries.

Does it detect both smoke and heat?

Yes. It combines a dual-spectrum optical smoke sensor with two Class A1R heat sensors, detecting both smoke and dangerous temperature rise in a single device.

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 common false-alarm sources such as steam and cooking fumes.

What happens during a power cut?

A non-replaceable CR-2/3AZ lithium backup battery keeps the detector operating and communicating during a mains failure, so protection is maintained.

Can it be installed outdoors?

No. The FireProtect 2 AC (Heat/Smoke) Jeweller is designed for indoor use only.

What colour options are available?

This product (article 60832.175.WH1) is the White version. A Black variant is also available under a separate article number.