Ajax EN54 Fire ReX Jeweller Black – EN54 Certified Wireless Fire Alarm Repeater with Coverage of Up to 35 km²
135976.358.BL1 # 125976 | Ajax EN54 Fire ReX Jeweller is a wireless repeater that extends network coverage, ensuring secure and stable communications even in large and complex installations. Thanks to Ethernet or wireless connection, it ensures reliable transmission of fire signals compliant with the EN54-21 standard, preventing sabotage and data loss. Compatible with fire alarm, automation, and intrusion protection devices, it supports up to 5 repeaters per system, reaching 35 km² of coverage. Remote management via the Ajax app, advanced encryption, and compatibility with MotionCam make it a professional, versatile, and certified solution for advanced security installations.
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135976.358.BL1 | WIRELESS REPEATER AGAINST INTRUSIONS

The Ajax EN54 Fire ReX Jeweler wireless repeater, 135976.358.BL1 , black, is designed to extend network coverage and ensure reliable communications in EN54-certified fire alarm systems. Thanks to Ethernet and wireless connectivity, it ensures secure signal transmission even in complex facilities, preventing sabotage and data loss. Compatible with fire alarm, automation, and intrusion protection devices, it supports up to 5 repeaters with coverage of up to 35 km², offering remote management via the Ajax app for professional and certified installations.
Main specifications:
- Coverage up to 1,800 m in open field
- Supports up to 5 repeaters per system (35 km²)
- EN54-21 compliant and secure alarm transmission
- Stable and secure Ethernet or wireless connection
- Compatible with MotionCam for visual alarm verification
Further details
Technical data sheet
135976.358.BL1 |
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Standards compliance | EN 54-4 EN 54-18 EN 54-25 EN 50131 (Grade 2) |
Data transmission |
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Alarm reception time | 0.3 s |
Photo delivery speed via Wings | up to 18 s It depends on the system parameters |
Photo delivery speed via Ethernet | up to 10 s It depends on the system parameters |
Communication with a CIE and devices (Jeweller and Wings) | |
Ethernet | 8P8C connector up to 100 Mb/s |
Operating frequency | 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 based on the reason for sale |
Maximum Effective Radiated Power (ERP) | up to 20 mW |
Communication range | up to 1,800 m in the open field |
Ping Interval | 12 -300 s It is set by a PRO or a user with administrator rights in Ajax Apps |
Protection against counterfeiting | Device Authentication |
Protection against inhibitions | Frequency hopping Authentic switching of communication channels in case of connection loss |
Diet | |
Main power supply | 110 - 240 V, 50/60 Hz |
Backup power | EN54 Internal Battery (24h) Li-ion battery 7.4V, 5Ah up to 24 hours of operation EN54 Internal Battery (72h) Li-ion battery 7.4V, 10Ah up to 24 hours of operation |
Installation | |
Operating temperature |
from -10°C to +40°C |
Maximum permissible humidity | up to 75% non-condensing |
Custody | |
Color | Black |
Dimensions | 210 x 210 x 50.5 mm |
Weight | TDB |
Protection class | IP20 |
Complete set | EN54 Fire ReX Jeweler SmartBracket mounting panel Installation kit Special tool (wrench) Quick Guide |