SON4B Alarm Sounder & Filament Lamp Beacon

  • Automatic synchronisation on multi-sounder system.
  • Continuously rated.
  • Stainless steel fixings.
  • Unit can be mounted using external lugs (on AC versions) or internal BESA compatible fixing positions.
  • Duplicate cable terminations (in & out for daisy-chain installations).
  • Tropicalisation available on request.
  • Available with custom tone configurations and frequencies.


  • VdS approved: EN54-3 (CPD 89/106/EEC).

  • GOST-R approved. Cert: POCC GB-JB05-H00144.

SON4B Alarm Sounder & Filament Lamp Beacon
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SON4B Alarm Sounder & Filament Lamp Beacon

The SON4B is a compact, high output, 100dB(A) alarm sounder with integral filament lamp beacon. The robust fire retardant housing ensures the SON4B is suitable for all general signalling applications including fire, security and process control.


Maximum output: 100dB(A) @ 1 metre [91dB(A) @ 10ft/3m]
Nominal output: 99dB(A) @ 1m +/- 3dB - Tone 1 [90dB(A) @ 10ft/3m]
No. of tones: 10 (UKOOA / PFEER compliant)
No. of stages: 3
Volume control: On board potentiometer
Effective range: 30m/99ft @ 1KHz
Stage switching: Negative
Light source: 1.3W Filament bulb/lamp
Flash rate: 1 Hz
Candela: 6 cd* (peak / effective intensity)
Lens / L.E.D.: Amber , Blue & Red
Voltages DC: 24V dc
Reverse polarity diode protection on DC units.
Voltages AC: 24V ac; 115V ac; 230V ac
Ingress protection: IP66
Housing material: High impact UL94 V0 & 5VA FR ABS
Colour: Red (RAL3000), grey (RAL7038) & white.
Lens material: PC
Cable entries: 4 x M20 clearance gland knockouts in side & back
Terminals: 0.5 to 1.5mm² cables.
Operating temp: -25 to +55°C [-13° to +131°F]
Storage temp: -40 to +70°C [-40° to +158°F]
Relative humidity: 90% at 20°C [68°F]
Weight: DC: 0.30kg/0.66Ibs AC:0.40kg/0.88Ibs
*SPL data +/-3dB(A). Measured at optimum voltage.
*Candela measurements representative of performance with amber lens at optimum voltage.

Part Codes

Version: Part code:
24V dc SON4BDC24[x]/[y]
24V ac SON4BAC24[x]/[y]
115V ac SON4BAC115[x]/[y]
230V ac SON4BAC230[x]/[y]
[x] = Housing colour: G: Grey R: Red W: White
[y] = Lens colour: A: Amber, B: Blue, R: Red


Version: Voltage: Current:
24V dc +/-25% 150mA
24V ac 50/60Hz +/-10% 180mA
115V ac 50/60Hz +/-10% 50mA
230V ac 50/60Hz +/-10% 30mA

Tone Table

Stage 1 WAV file Frequency Description. Stg 2 Stg 3
T 1 /system/1/assets/files/000/000/419/419/e353c86c4/original/TF002.WAV 800/1000Hz @ 0.25 sec Alternating T 8 T 5
T 2 /system/1/assets/files/000/000/417/417/abf396de0/original/TF003.WAV 500/1200Hz @ 0.3Hz 0.5 sec Slow Whoop T 1 T 8
T 3 /system/1/assets/files/000/000/386/386/ceb4e488c/original/TF009.WAV 1200/500Hz @ 1Hz - DIN / PFEER P.T.A.P. T 1 T 8
T 4 /system/1/assets/files/000/000/382/382/2c2978b6a/original/TF017.WAV 544Hz (100mS)/440Hz (400mS) - NF S 32-001 554Hz T 2
T 5 /system/1/assets/files/000/000/405/405/214ccf82a/original/TF037.WAV 1000Hz Continuous - PFEER Toxic Gas T 1 T 6
T 6 /system/1/assets/files/000/000/395/395/631e82dc8/original/TF026.WAV Bell T 1 T 8
T 7 /system/1/assets/files/000/000/392/392/68d5d1294/original/TF029.WAV 800/1000Hz @ 7Hz Sweeping T 5 T 1
T 8 /system/1/assets/files/000/000/398/398/7c1bf5e00/original/TF025.WAV 2400/2900Hz @ 50Hz Sweeping T 5 T 1
T 9 /system/1/assets/files/000/000/402/402/9168c8c48/original/TF035.WAV 420Hz @ 0.625 sec Australian Alert T 10 T 5
T 10 /system/1/assets/files/000/000/400/400/aba6c8a51/original/TF036.WAV 500-1200Hz 3.75sec /0.25sec. Australian Evac. T 6 T 5
Country specific or custom tone configurations and alarm frequencies are available upon request.