VSO-32E Base Sounder

Product Overview

The VSO base sounder is for use with conventional fire alarm systems, including two-wire (SAV-WIRE®) and is designed to accept most leading detector bases and offers a cost-effective solution to sounder installation. The low profile sounder is supplied with 32 tones, along 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. This sounder has been fully approved to EN54-3 by the LPCB and VdS on tones 1, 3, 11, 25 and 27.

When a detector is not fitted to the sounder, a blank cover plate is available so that the unit can be used as a standalone sounder.


  • 32 tones plus a selectable override tone
  • Switch selectable volume control
  • Designed to work with both conventional and two-wire (SAV-WIRE®) systems
  • Fully approved to EN54-3 by LPCB and VdS
  • Modern ultra-low profile for discreet mounting
  • Designed to accept most leading detector bases


Approvals: EN54-3


Voltage 18 – 30 V dc
Tones 32
Monitoring Reverse Polarity
Volume Setting Low – 88.7 dB
Med – 90.4 dB
High – 93.8 dB
Current at 24V dc Low – 6 mA
Med – 8 mA
High – 12 mA
Dimensions (inc cover) 166mm D x 25mm H
Temperature Range -20°C to +70°C (no icing)
Humidity 0% to 95% (no condensation)
IP Rating IP21C
Weight 110 grams


Item Numbers

VSO-32-E Base Sounder, White Body, 32 Tones
Base Sounder, Ivory Board, 32 Tones
VSO-CP-W White Cover Plate
VSO-CP-R Red Cover Plate