Addressable Loop Sounder with Built in two Isolator

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The indoor sounders are used independently for signaling an alarm directly at the fire location.

Brand: BOSCH

Country of Origin: GERMANY

Model: FNM-420-A-RD, Manufacture in BOSCH own Factory


  • Volume of up to 101.3 dB(A)
  • Maximum current consumption of less than 3.9 mA
  • Up to 100 sounders per LSN loop
  • Immediate synchronization
  • 32 different tone types can be selected (incl. DIN



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 101.3dB(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 < 3,9 mA

2 | FNM-420-A Sounder Indoor


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

Dimensions (H x W x D) 105 x 105 x 95 mm


• Material Plastic, ABS

• Color red, similar to RAL 3001

white, similar to RAL 9010


• Without packaging 250 g

• With packageing 300 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 42 *

* Manufacturer’s declaration, not third party approved

Special features

Sound pressure level at a distance

of 1 m

max. 101.3 dB(A)

Frequency range 440 Hz up to 2,90 kHz

Certifications and approvals

Complies with

• EN 54-3:2001

• EN 54-17:2005

Region Certification

Europe CE FNM-420-A-WH, FNM-420-A-RD

CPD 0832-CPD-1006 FNM-420-ARD_


Germany VdS G 210002 FNM-420-A-WH/-RD

Poland CNBOP 0912/2011 FNM-420-A-RD -B-RD -AWH

MOE UA1.016.0113309-11 FNM-420-AWH_


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