Bosch Addressable Sounder with Flash light with Built in two Isolator

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Manufacture in BOSCH own Factory

Alarm triggering by pressing the black marking or breaking the glass pane, Protection against injury through foil-labeled glass pane, LED display for triggered alarm or inspection evaluation

Individual call point identification, Call point query routines with evaluation and multiple transmission

Brand : Bosch

Model: FNM-420-A-BS-RD + FNS-420-R

Country of Origin: GERMANY


  • Volume of up to 92.1 dB(A)
  • Maximum current consumption of less than 3.85 mA
  • Up to 100 sounders per LSN loop
  • Immediate synchronization
  • 32 different tone types can be selected (incl. DIN


The Base Sounders Indoor are used for signaling an

alarm directly at the fire location. They can be

employed either as base sounders or stand-alone


The device allows to select 32 types of alarm and

evacuation tones (including DIN tone 33404, part 3)

for different requirements.

You can adjust the sound pressure by five levels

according to the operational environment. Depending

on the tone type and volume set, the sound pressure

varies between 65 dB(A) and 92.1 dB(A).

Sounders of the same LSN loop and with the same

tone type provide immediate synchronization. The

device maintains LSN loop functions in the event of

wire interruption or short-circuit thanks to two

integrated isolators.

Change of the device settings can be done in the

FSP-5000-RPS programming software.

Technical specifications



Operating voltage 15 V DC to 33 V DC

Current consumption

• Quiescent state < 1 mA

• Alarm < 3.85 mA


Connections (inputs/outputs) 0,28 mm² to 2,5 mm²

Dimensions (Ø x H)

• With mounting plate 115 x 40 mm

• With spacer for surface


115 x 50 mm


• Material Plastic, ABS

• Color red, similar to RAL 3001

white, similar to RAL 9010


• Without packaging 200 g

• With packageing 245 g

Environmental conditions

Permissible operating temperature -25 °C to +70 °C

Permissible storage temperature -25 °C to +85 °C

Protection class as per EN 60529 IP 43 *

* Manufacturer’s declaration, not third party approved

Special features

Sound pressure level at a distance

of 1 m

max. 92.1 dB(A)

Frequency range 440 Hz up to 2,90 kHz

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