Sounder with Dual LED Visual Alarm Device
EN54-3 and EN54-23

This EN54 compliant sounder / strobe provides a high efficiency, low power solution for alarm signalling when both audible and dual visual alarm signals are required.

Combined into one unit with a unique first fix installation method in the base, this unit is quick to install to reduce the cost of installation.

The high quality and robust design ensures that the user has trouble free operation over the life of the product, even in tough environments.

With a wide range of selectable options for tones and flash, the product is suitable for a wide range of applications.


Key Features
EN54 approved.
Dual two stage Visual Alarm device.
Quick First fix installation.
Wide operating voltage.
Low power consumption.
Full monitoring of pre-alarm and alarm modes.
32 alarm tones.
Fully synchronised.
IP65 rated with Deep base.

Key Benefits
Reduces costs where multiple VAD are required.
Lower installation costs.
One unit suits many applications.
High specification and efficiency simplifies product selection.

Offices, Retail outlets, Commercial and Industrial sites.
Where visual alarms are required with audible alarms.
Where low power consumption is required with a high light output.
Order codes
NSF100R-R-S Sounder in Red with red strobe and shallow base
NSF100R-R-D Sounder in Red with red strobe and Deep base
NSF100R-W-S Sounder in Red with white strobe and shallow base
NSF100R-W-D Sounder in Red with white strobe and Deep base
NSDF100R-RW-S Sounder in Red with dual Red & White strobe and shallow base
NSDF100R-RW-D Sounder in Red with dual Red & White strobe and deep base

NOTE: All products use a clear lens whether fitted with White or RED LEDs.
The dual colour version uses one red diffusor and one clear lens.

Contact us for details.

Additional information

Supply voltage range

Compliant operating range 18—56 V dc, Maximum Max Operating range 18 – 56V dc

Current consumption

VAD 10mA to 30mA dependent on setting : Sounder 10mA to 30mA depending on setting

Power consumption

Max. 2.4W : 0.5W to 2.4W depending on setting and supply voltage

Cable monitoring

Individual reverse polarity monitoring on both Pre-alarm and Alarm circuits

Terminal size

0.28 to 2.5mm² conductor

LED Configuration

Red and White LED’s (Red above White)



EN54 –23 coverage

W2.4—7.6 (High setting) : W2.4-5.6 (Low setting)

EN54 –23 coverage volume

138m³ (High setting) : 75m³ (Low setting)

Sound Output

98dB(A) to 110dB(A) depending on tone

32 selectable tones

Selected via DIL switch

Volume control

Provides up to -15dB attenuation

Flash options

High and low output, 1s and 2s flash rates DIL switch selectable


V0 rated ABS body & base, V0 Polycarbonate lens


226g Deep base :146g Shallow base

Base colour

White or Red

Lens colour


Fixing method

Body to base – Bayonet auto connect, Base to wall – Screw

Operating temperature

–25°C to +75°C

IP Rating