W-2.75-9 Hi-Output Wall VAD c/w 103dB(A) Sounder View larger

CAST Hi-Output W-2.75-9 Wall VAD c/w 100dB(A) Sounder (shallow base)



  • LPCB certified to EN54-3, 17 & 23 and Kiwa Telefication certified to EN54-13.
  • Provides 'W-2.75-9' rated light distribution. Also rated as a W-4-4 VAD.
  • Impressive 100dB(A) sound output @ 1m.
  • Onboard short-circuit loop isolator.
  • 13.5mA typical alarm current (460µA typical quiescent current @ 27-40V DC (VAD lit, sounder on max).
  • Group addressing facility allows multiple devices to be operated simultaneously.
  • 4 selectable volume levels and 31 selectable tones.
  • IP21C (Type A) rated.


More details

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More Information

'CAST' is the world’s most-advanced 'distributed intelligence’ fire alarm system protocol. Conceived, designed and realised by C-TEC as part of a five-year, multi-million pound project, it involved the creation of a powerful proprietary communication protocol (C-TEC Addressable System Technology, CAST) and multiple control panels & field devices. Now available to purchase, its key features include:

• 255 devices per loop.
• Autonomous decision-making for faster response times.
• Multiple type codes.
• 40V loop drive voltage.
• Two ‘soft’ addressing options – automatic via the panel or manual via a powerful handheld programmer.
• Powerful multi-level addressing facilitates easy device addition and swapped device identification.
• Multiple functionality at a single address (integrated devices) - coming soon.
• Volumes, tones & detector modes can be changed at compatible panels.
• High-speed data transmission and robust data transfer.
• Intrinsically EN54-13 compliant.
• Provides geographical location of short and open circuit faults (a short circuit isolator is included as standard in every CAST field device).
• Replace device function.
• Future seamless integration with other CAST life safety systems reducing energy, servicing, installation and repair costs.
• Designed and manufactured in the UK.

Technical Specifications

Approvals/certificationsLPCB certified to EN54-3, 17 & 23 and Kiwa Telefication certified to EN54-13.
Protocol/compatibilityCompatible with C-TEC's CAST protocol Addressable Fire Panels.
Application/operationDesigned to be wall mounted. Indoor areas only.
VAD category & coverageW-2.75-9 rated light distribution. Also certified as a W-4-4 rated VAD.
Flash rate & colour0.5Hz / White.
Supply/operating voltage27 to 40V DC.
Quiescent current460µA typical.
Nominal SPL (Sound Pressure Level)100dB(A) when set to tone 1.
Alarm current13.5mA typical @ 27-40V DC (VAD lit, Sounder on max).
IndicatorsPolling (red LED).
Product dimensions (mm)108mm diameter x 99mm deep.
IP RatingIP21C (Type A).
Operating conditions/temperature-10ºC to +55ºC. Max. 95% RH (Non-condensing).



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VAD coverage (with multiplication factors applied)

VAD coverage depends on factors such as ambient light and viewing angle (direct or indirect). The table below summarises how the coverage of the CA433A/SR increases or decreases based on these factors. To use the table, calculate the lux level of the area requiring coverage, determine whether the viewing angle will be direct or indirect then read off the coverage in the relevant column. For further information refer to our VAD System Design Guide, downloadable from the Documentation tab below.

 W-2.75-9 Wall MountedW-2.75-9 Wall MountedW-4-4 Wall MountedW-4-4 Wall Mounted
Lux level in area requiring coverageDirect ViewingIndirect ViewingDirect ViewingIndirect Viewing
000-101 lux14.30m H x 46.80m W4.95m H x 16.2m W20.8m H x 20.8m W7.2m H x 7.2m W
101-200 lux12.10m H x 39.60m W4.67m H x 15.3m W17.6m H x 17.6m W6.8m H x 6.8m W
201-300 lux8.80m H x 28.80m W3.85m H x 12.6m W12.8m H x 12.8m W5.6m H x 5.6m W
301-400 lux6.32m H x 20.70m W3.30m H x 10.8m W9.2m H x 9.2m W4.8m H x 4.8m W
401-500 lux4.95m H x 14.40m W2.75m H x 9m W7.2m H x 7.2m W4.0m H x 4.0m W
501-600 lux3.57m H x 11.7m W2.47m H x 8.1m W5.2m H x 5.2m W3.6m H x 3.6m W
601-700 lux2.75m H x 9.0m W1.92m H x 6.3m W4.0m H x 4.0m W2.8m H x 2.8m W
701-800 lux1.90m H x 6.3W1.65m H x 5.4m W2.8m H x 2.8m Wnot applicable

Approval Certificates

Approval Certificate (LPCB)


EC Certificate of Conformity (CPR)


Declaration of Performance (C-TEC)


Declaration of Conformity (C-TEC)


EN54-13(2017) System Certificate