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45681-290_DBL_LST_EN_0804.PDF • PAGE 1
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Building Safety. Building Security.
Description
The Integrated Base Sounders 45681-277, 45681-290 
and  45681-300  are  fi tted  into  a  round,  white  plastic 
case with an integrated base for accommodating au-
tomatic Fire Detectors or Strobes Series XP95 or Dis-
covery.
The sounders are powered and actuated as modules via 
the ADM loop with Apollo/Discovery protocol. They can 
be used in combination with a detector or strobe, or as 
stand-alone device. For the latter case an optional white 
or red plastic lid is available. Furthermore, the sounders 
are equipped with an integrated dual-isolator module.
Two  different  tone  types,  depending  on  the  sounder 
model, are available, and they can be selected during 
parameterisation of the Fire Detection Control Panel Se-
ries BC216. If several sounders are actuated in parallel, 
they are synchronized by Fire Detection Control Panels 
Series BC216 to generate a uniform warning tone.
In case of activation, the sounder is tested acoustically 
by means of an integrated microphone.
The address of the sounder as well as the sound level 
are selected by means of a DIL switch.
The  base  sounders  have  been  designed  for  indoor 
mounting.  An  optional  mounting  plate  is  available  for 
surface mounted cabling.
•   ADM loop technology with
Apollo/Discovery protocol
•   Integrated detector base with
dual-isolator
•  Warning tone 1kHz
•   Slow whoop tone – NEN 2575
•   Emergency signal tone – DIN 33404
•   Sound level selectable in two steps– 
up to 91dB(A)
•   Integrated acoustical self test
Specifi cations
Operating voltage 
17 – 28VDC
Current consumption  
 max. 200µA (sounder off)
max. 5mA (sounder on)
Sound level 
55 – 75dB(A) or
 
75 – 91dB(A)
Ambient temperature 
-20°C to +60°C
Dimensions ø × H 
115 × 38 (mm)
Colour 
white
Weight 
140g