119916.274.BL1 # 119916 | Ajax EN54 FireProtect (Heat) Jeweller is a black rate-of-rise heat detector that combines advanced temperature detection with a built-in 85 dB siren, ensuring timely intervention in the event of a fire. Equipped with a double thermistor and Jeweller radio communication up to 1,700 m, it is easy to install and manage via app. It has a 5-year battery life thanks to the pre-installed CR123A batteries. Certified to EN 54-5 and 54-3, it is ideal for industrial and residential environments.
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119916.274.BL1 | WIRELESS RATE-OF-RISE HEAT DETECTOR WITH ACOUSTIC SIGNALING DEVICE

The Ajax EN54 FireProtect (Heat/Sounder) Jeweller, 119916.274.BL1 , is a black wireless rate-of-rise heat detector that provides reliable fire protection with precise smoke or heat detection and radio transmission up to 1,700 m. Also available with a built-in siren, it is easy to install with SmartBracket and offers up to 5 years of battery life. EN54 certified, it is suitable for residential and professional use thanks to configuration via the Ajax app.
Main specifications:
- Jeweller two-way radio communication up to 1,700 m
- Smoke detection with optical sensor or heat detection with double thermistor
- Built-in siren (Sounder models only) with 32 selectable tones
- Powered by pre-installed CR123A batteries (5-year battery life)
- Easy installation without screws and management via the Ajax app
- EN 54-3, EN 54-5, EN 54-7 certifications (depending on the version)
Further details
- EN 54-5 for heat detection
- EN 54-7 for smoke detection
- EN 54-3 for acoustic alarm devices
Technical data sheet
119916.274.BL1 |
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Capacity | |
Communication | |
Jeweler communication technology | Proprietary wireless communication technology to transmit commands, alarms, and events. Key features:
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Frequency bands | 866.0–866.5 MHz 868.0–868.6 MHz 868.7–869.2 MHz 905.0–926.5 MHz 915.85–926.5 MHz 921.0–922.0 MHz Depends on the sales region. |
Maximum effective radiated power (ERP) | up to 20 mW Automatic power control to reduce power consumption and radio interference. |
Radio signal modulation | GFSK |
Radio communication range | up to 1,700 m up to 5,550 ft Between the CIE and connected devices (in an open space). Maximum range depends on the connected device. |
Encrypted communication | All stored and transmitted data are protected by block encryption featuring a dynamic key. |
Frequency hopping | To prevent radio interference and jamming. |
Dangerous temperature detection | |
Sensitive element | 2 × thermistors According to the EN 54-5 requirements for heat detectors of Class A1, B, and C with rate-of-rise (R) and static (S) response types. |
Heat sensor modes |
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Alarm annunciation | |
Alarm type | acoustic |
Sound volume | up to 95 dB at a distance of 1 m 3.3 ft Adjusted by a PRO or user with admin rights in an Ajax app. |
Sound pattern | 32 tones |
Sound synchronization | An audible alarm is automatically synchronized on all devices with a sounder connected to the same CIE. |
Alarm annunciation test | An audible alarm check to ensure the fire alarm is clearly audible on the premises. |
Installation recommendations | The device is designed for indoor use only. The SmartBracket mounting panel allows the detector to be rotated up to 90° even after installation. |
Sabotage protection | |
Tamper button | Fault notification when an attempt is made to remove the device from the mounting panel. |
Lock for SmartBracket | to secure the device on the SmartBracket mounting panel When locked, the lock secures the device and prevents it from being removed without a special tool. |
Protection against spoofing | device authentication |
Connection loss detection | after 36 s Detection time depends on Jeweler settings |
Power supply | |
Battery | 2 × CR123A Pre-installed |
Tool-free battery replacement | To replace the batteries, open the lids of the battery compartments. |
Reverse polarity protection | Prevents device damage if the batteries are put in incorrectly. |
Recommended battery type | Huiderui CR123A; 3V; 1,600 mAh, LiMnO₂ |
Calculated battery life | up to 6 years |
Enclosure | |
Dimensions | 124 × 124 × 48 mm 4.87" × 4.87" × 1.90" |
Weight | 278 g 9.81 oz |
Operating temperature range | from 0 °C to +50 °C from 32 °F to 122 °F |
Operating humidity | up to 80% |
Protection class | IP21C |
Flammability rating | UL 94 V-0 |
Color | Black |
Complete set | EN54 FireProtect (heat/sound) Jeweller SmartBracket mounting panel 2 × CR123A battery (pre-installed) Quick start guide |
Warranty | 24 months |