Cranford Controls

VTB Spatial Sounder/Beacon 24Vdc

Product Overview

The VTB 24Vdc sounder beacon is part of the VTG family of products designed for use with conventional fire alarm systems including two wire (SAV-WIRE®) and other general 24Vdc applications.

The sounder function, like all VTG products, comes as standard with 32 tones. The beacon function has been designed for maximum all-round visibility, coupled with low power consumption utilising an array of energy efficient LEDs. The sounder function features a two-stage alarm override which is activated by a third negative wire from the fire panel.

Both the sounder and beacon functions are fully synchronised. The product can also be used as a beacon only which is easily selected by a DIL switch at the time of installation.


  • 32 tones plus a selectable override tone
  • Shallow base IP43 and deep base IP65 versions available
  • Switch selectable beacon only feature
  • Unique twist and lock bayonet mounting system
  • Removable cover on deep base for surface wiring
  • Features base locking system as standard


Voltage Range (Vdc) 18 – 35
Number of Tones 32
Operating Frequency (Hz) 440 – 2900
Temperature Range (C°) -20 to +70
Flash Rate c. 1Hz
Monitoring Reverse Polarity
Protection Rating IP43 (Shallow) / IP65 (Deep)
Boxed Weight (kg) 0.223 (Shallow) / 0.258 (Deep)
Body Colours Available Red or White (ABS Fire Retardant Plastic)
Lens Colours Available Red, Amber, Clear or Blue



Volume Setting High Med Low
Sound Output, Typical (dBA) 99.1 95.4 79.7
Sound Output, Anechoic Chamber (dBA) 98 94.3 78.5
Sound Output, Reverberation Chamber (dBA) 113.6 110.2 96
Max. Current Consumption @ 24Vdc (mA) 34.4 19.9 10.8
Power Consumption @ 24Vdc (mW) 826 478 259


Part Numbers

511-031L Red Body, 32 Tone, Shallow Base, Red Lens
511-033L Red Body, 32 Tone, Deep Base, Red Lens
511-032L White Body, 32 Tone, Shallow Base, Red Lens
511-034L White Body, 32 Tone, Deep Base, Red Lens

Other colours and base combinations are available, please refer to the datasheet or price list for part numbers.