Cranford Controls

VTG Spatial Sounder 24Vdc – EN54-3 Approved

Product Overview

The VTG family of sounders has been designed to cover a wide spectrum of applications. The 24 volt EN54-3 approved version is for use with conventional fire alarm systems including two wire (SAV-WIRE®) and as standard comes with 32 tones. The sounder is supplied with a two stage alarm override which is activated by a third negative wire from the fire panel.

All tones have been selected to comply with the latest sound patterns and frequencies used throughout the world. All tone options are fully synchronised. The sounder function has been fully approved to EN54-3 by the LPCB and VdS on tones 1, 8, 11, 25 and 27.


  • Fully approved to EN54-3 by LPCB and VdS
  • 32 tones plus a selectable override tone
  • Shallow base IP21C and deep base IP33C versions available
  • Designed to work with both conventional and two-wire (SAV-WIRE®) systems
  • Unique twist and lock bayonet mounting system
  • Removable cover on deep base for surface wiring
  • Features base locking system as standard


Voltage Range (Vdc) 21.6 – 28
Number of Tones 32
Operating Frequency (Hz) 440 – 2900
Temperature Range (C°) -20 to +70
Monitoring Reverse Polarity
Protection Rating IP21C (shallow) IP33C (deep)
Boxed Weight (kg) 0.22 (shallow) 0.25 (deep)
Body Colours Available Red or white (ABS fire-retardant plastic)



Volume Setting High Med Low
Sound output, typical (dBA) 102.3 97.6 82.1
Sound output, anechoic chamber (dBA) 99.9 95.6 80.1
Sound output, reverberation chamber (dBA) 117.7 110.7 95.3
Max. current consumption @ 24Vdc (mA) 30.8 16.4 8.3
Power consumption @ 24Vdc (mW) 739 394 199


Part Numbers

510-017 Red body, 32 tone, shallow base
510-019 Red body, 32 tone, deep base
510-018 White body, 32 tone, shallow base
510-020 White body, 32 tone, deep base