Ajax EN54 FireProtect White Certified Wireless Smoke and Heat Detector with Siren and HazeFlow 2 Technology
155887.379.WH1 # 155887 | Ajax EN54 FireProtect (Heat/Smoke) white is a certified wireless fire detector designed for professional environments, which combines smoke and rate-of-rise heat detection with high reliability and accuracy, compliant with EN54 standards. Thanks to the dual-spectrum optical sensor with HazeFlow 2 technology, it effectively distinguishes real smoke from steam, reducing false alarms, while the smoke chamber protected from dust and insects ensures stability over time. It integrates Jeweller radio communication up to 1700 m and an acoustic siren up to 85 dB , providing immediate and responsive safety. Equipped with a double thermal sensor with thermistors and a battery with up to 5 years of autonomy , it ensures continuous operation without frequent maintenance. The compact and professional design makes it ideal for intelligent fire systems and certified installations.
155887.379.WH1 | WIRELESS RATE-OF-RISE HEAT AND TEMPERATURE DETECTOR

Ajax EN54 FireProtect (Heat/Smoke) , 155887.379.WH1 , white is a professional wireless fire detector designed to ensure maximum safety and compliance with EN54 regulations, combining advanced smoke and temperature detection in a single device. Thanks to the dual-spectrum optical sensor and the HazeFlow 2 algorithm, it accurately distinguishes between real smoke and steam, reducing false alarms and improving reliability. Jeweller radio technology ensures stable communication up to 1700 meters , while the built-in siren provides an immediate audible warning. The device is designed to last over time with a battery life of up to 5 years and simple and quick installation, ideal for certified fire protection systems and professional environments.
Main specifications:
- Combined smoke and rate-of-rise heat detection
- Dual-spectrum optical sensor with HazeFlow 2 technology
- Jeweller radio communication up to 1700 m
- Built-in siren up to 85 dB
- EN54 certification and regulatory compliance
- Battery life up to 5 years
Further details
Technical data sheet
155887.379.WH1 |
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| Dangerous temperature detection | |
| Sensor type | 2 x thermistors |
| Heat sensor mode |
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| Alarm signal | |
| Alarm type | Acoustic signal |
| Sound indication | Sound volume: up to 85 dB at 1m distance It can be set up by a PRO or a user with administration rights in the Ajax app |
| Sound model | 32 |
| Alarm synchronization | On all devices with an acoustic signalling device connected to the same CIE |
| Communication with the CIE or repeater | |
| Communication technology | Jeweler |
| Operating frequency | 866.0 - 866.5 MHz 868.0 - 868.3 MHz 868.7 - 869.2 MHz 905.0 - 926.5 MHz 915.85 - 926.5 MHz 921.0 - 922.0 MHz Based on sales region |
| Maximum Effective Radiated Power (ERP) | Up to 20mW |
| Communication range | Up to 1,700m in the open field |
| Standards compliance | |
| EN 54 FireProtect (Heat/Smoke) | EU CPR: EN 54-5, EN 54-7, EN 54-25 Directive 2014/53/EU (RED) BOSEC |
| Smoke detector | |
| Sensor type | Dual-spectrum optical sensor Detects smoke based on the size of particles in the air |
| Protection against false alarms | The device does not respond to water vapor |
| Patented smoke chamber | Protects the smoke sensor from dust, dirt and insects |
| Custody | |
| Color | White |
| Dimensions | 124 x 124 x 54.2 mm |
| Weight | 278 g |
| Operating temperature | from -10°C to +50°C |
| Maximum permissible humidity | up to 90% |
| Protection class | IP21C |
| Flammability class | UL 94 V-0 |
| Diet | |
| Battery | 2 × CR123A Pre-installed |
| Replacing the battery | Without tools |
| Battery life | up to 5 years |
| Complete Set | EN54 FireProtect (heat)/smoke Jeweller SmartBracket mounting panel 2 × CR123A batteries (pre-installed) Installation kit Quick Guide |
| Warranty | 24 months |



