Ajax EN54 Fire ReX Jeweller – Wireless signal amplifier for professional fire alarm systems

The Ajax EN54 "Fire ReX" is an EN-54 compliant wireless signal repeater that significantly extends the range and reliability of Ajax EN54 Line fire alarm systems. Designed for large, sprawling, or structurally challenging buildings, it ensures stable and secure communication between the fire alarm control panel (CIE) and all connected devices – even through steel, concrete, and solid walls.

Maximum range for complex objects

The EN54 Fire ReX Jeweller extends the wireless connection between the EN54 Fire Hub Jeweller and system devices up to 1,800 meters. Within an Ajax system, up to five wireless signal repeaters can be used, enabling coverage of up to 35 km². Ideal for:

• Schools & Office Buildings
• Shopping and business centers
• Warehouses & Industrial Facilities
• Buildings with underground parking garages or metal structures

Flexible system expansion without limitations

Each EN54 Fire ReX Jeweller supports any combination of devices within CIE limits – for fire protection, automation, and intrusion detection. This allows for flexible setup of even large installations without losing the benefits of the integrated Ajax ecosystem, including visual alarm verification.

Reliable communication – wireless or via Ethernet

The wireless signal booster can be connected to the CIE wirelessly or via Ethernet, with the wired channel being prioritized. This guarantees maximum operational reliability even in particularly demanding environments.
The encrypted two-way communication is based on the proprietary Ajax radio protocols Jeweller, Wings and TurboWings .

Reliable power supply with emergency power option

The EN54 Fire ReX Jeweller connects directly to a 110–240 V mains power supply (power cord not included). It also features a compartment for optional backup batteries.

• EN54 Internal Battery (24h)
• EN54 Internal Battery (72h)

The batteries enable autonomous operation for up to 72 hours and can be replaced during operation without switching off the fire alarm control panel.

For professional EN-54 installations

As part of the Ajax Systems ecosystem, the EN54 Fire ReX Jeweller is the perfect solution for implementing wireless fire alarm systems that are compliant with standards, scalable and highly reliable – regardless of building size or construction.

Connection options

• Number of EN54 Fire ReX Jewellers affiliated with the CIE: up to 5
• Number of devices connected to the EN54 Fire ReX Jeweller: up to 199

wireless connection

• Jeweller Communication Technology
  • 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
  • Maximum effective radiated power (ERP): up to 20 mWM
  • Radio signal modulation: GFSK
  • Radio range: up to 1800 m

Between the CIE and connected devices (in open space). The maximum range depends on the connected device.

• Wings communication technology

Proprietary wireless technology for transmitting photos for alarm verification and firmware updates.

• • 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
  • Radio range: up to 1800 m

Between the CIE and a radio signal repeater, or between a radio signal repeater and the connected devices (in an open space). The maximum range depends on the connected device.

Communication channels

• Ethernet: 1x 8P8C connector (Up to 100 Mbit/s.)

Transmission time

• Alarm transmission time to the CIE: 0.3 s
• Photo transmission time to the CIE:
  • 18 s (Via EN54 Fire ReX Jeweller with the Wings channel. The transmission time depends on the settings.)
  • 10 s (Via EN54 Fire ReX Jeweller using the Ethernet channel. The transmission time depends on the settings.)

--- Installation Recommendations ---

The device is suitable for indoor use only.

The operating voltage of the device is 110–240 V~.

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Sabotage protection

• Sabotage contacts: 2

Notifications about the error when attempting to detach the device from the surface or remove the mounting plate.

• Protection against device spoofing: Device authentication
• Detection of connection interruptions: after 36 seconds

The detection time depends on Jeweller's settings.

power supply

• External: 100–240 V, 50/60 Hz

Power consumption up to 0.48 A.

• Internal: 7.4 V⎓, 5 Ah/10 Ah

With a rechargeable Li-ion battery (not included): EN54 Internal Battery (24h) or EN54 Internal Battery (72h).

• Standby current consumption of the device at nominal voltage: 80 mA
• Maximum current consumption at nominal voltage: 105 mA
• Low battery voltage: 6 V⎓
• Recovery voltage at low battery charge: 6.2 V
• Battery voltage at the end of the runtime: 6 V (The device is switched off.)
• Minimum charge level of the emergency power battery when fully charged: 8 V

Autonomous operation

• With internal battery: up to 50 hours

When Ethernet is enabled. With EN54 internal battery (24h), not included in the complete set.

• up to 100 hours

When Ethernet is enabled. With EN54 internal battery (72h), not included in the complete set.

Housing

• Dimensions: 210 × 210 × 51 mm
• Weight: 890 g
• Operating temperature: from −10 °C to +40 °C
• Operating humidity: up to 75% non-condensing
• Protection rating: IP20
• Flammability class: UL 94 V-0
• Colors: Black, White