Redback 7 Day School Timer With Evac Tone Generator (A4500C)


A 4500C

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The Redback 7 Day School Timer with Evac Tone Generator (4500C) combines a weekly timer and evacuation controller in a compact 1RU rack mount chassis. It offers a total of 50 event switching times, with each event configurable from 1 second to 24 hours. When an event is triggered, an MP3 audio file plays from one of 99 folders on the included micro SD card, featuring bell, pre-bell, music, and additional folders (5-99). If a folder contains multiple MP3 files, they will play randomly. Events can be programmed directly on the unit or via the included PC software.

The evacuation controller meets industry standard building emergency alert and evacuation requirements. When connected to a paging system amplifier, it can alert and evacuate building occupants during emergencies such as fires, gas leaks, bomb scares, or earthquakes. The unit supports connection to the A4660 paging console for emergency paging and remote activation of alert/evac and chime functions. Remote activation is also possible through wall plates wired to the controller using Cat5 UTP cabling.

Timer and bell times can be managed remotely over a local area network (LAN) or virtual private network (VPN) using the A 4498 Ethernet adaptor pack, ensuring easy and efficient control.



  • MP3 bell, prebell & music timing outputs.
  • Emergency tones conform to AS 1670.4.
  • Random play for prebell and music.
  • Easy PC based timing event setup.
  • Remote triggering of alert, evac and bell.
  • Provision for connection to A4660 touchscreen paging console.
  • Switched 24VDC out for bell, alert/evac.
  • Pluggable screw terminal connections.
  • Auxiliary level output.
  • Battery backup of current time.
  • 24V DC operation.
  • Standard 1U 19” rack mount case.
  • Suitable for any amp with an aux input.
  • 10 Year Warranty
  • Australian Designed and Manufactured
  • Includes Power Supply




Output Level: 0dBm

Distortion: 0.01%

Frequency Response: 140Hz - 20kHz

Signal to noise ratio: Lockdown/Fire/Chime - 70dB typically


Output Connectors

Audio Output: RCA Stereo Socket

Common 24V DC Out: Screw Terminals

Lockdown 24V DC Out: Screw Terminals

Fire 24V DC Out: Screw Terminals

Bell 24V DC Out: Screw Terminals

Please Note: Output loads limited 0.12Amp each


Input Connectors

24V DC Power: Screw Terminals

24V DC Power: 2.1mm DC Jack

Remote Lockdown, Fire, Bell, Cancel: Screw Terminals

Muting: Via Microphone Switch Contact



Lockdown/Fire: Rear Volume

Voice over: Rear Volume

Bell: Rear Volume

Prebell: Rear Volume

Music: Rear Volume

Power: On/Off Switch

Alert Switch: Illuminated Push Switch

Evac Switch: Illuminated Push Switch

Bell Switch: Illuminated Push Switch

Cancel Switch: Push Switch

Indicators: Power on, MP3 error, Prebell, Music, Other MP3 folders

MP3 File Format: 128kbps or 320kbps, 44.1kHz, 32bit, VBR or CBR, Stereo.



Power Supply: 24V DC

Dimensions: ≈482W x 175D x 44H

Weight: ≈2.1 kg

Colour: Black


*Specifications are subject to change without notice.

Redback 7 Day School Timer With Evac Tone Generator (A4500C)

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Australian owned since 1980


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