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GPH1/GPH2 Alarm Horn - Buzzer 2-21-120

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The GPH series are low profile, high output, 105dB(A) alarm horns designed as a maintenance free, reliable alternative to solenoid type buzzers.
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Alarm Horn - Buzzer


The GPH1 is a surface mount version with back box, the GPH2 is a flush mount variant for use in panel mount applications or for use with standard 4’’ back boxes. Low current consumption and high SPL in a robust, fire retardant housing, ensures the GPH is suitable for all general signalling applications.


Datasheet Datasheet.pdf
Installation Manual ISN5301-B.pdf
UL certifcate of compliance UL_CoC_-_20120402-S7995_GPH1__GPH2.pdf
Russian EAC Declaration of Conformity D-GB.GA05.B.12595-20-24.03.2025.pdf
Declaration of Conformity DC-030_Issue_E_GPH.pdf
Declaration of Conformity UKCA DC-030_Issue_F_GPH.pdf
2D drawing (PDF) SK0166_Issue_B.pdf
2D drawing (PDF) SK0167_Issue_B.pdf
2D drawing (DWG) SK0166_Issue_B.dwg
2D drawing (DWG) SK0167_Issue_B.dwg
3D drawing (STEP) SK166-3D_Issue_B.STEP
3D drawing (STEP) SK167-3D_issue_B.STEP
Hi-res product image 1 (TIFF) 2-21-120_GPH1.tif
Hi-res product image 2 (TIFF) 2-21-120_GPH2.tif
Lo-res product image 1 (JPG) 2-21-120_GPH1.jpg
Lo-res product image 2 (JPG) 2-21-120_GPH2.jpg


  • Automatic synchronisation on multi-sounder system.
  • Continuously rated.
  • Stainless steel fixings.
  • Duplicate cable terminations (in & out for daisy-chain installations).


Nominal output: 105dB(A) @ 1m +/- 3dB [96dB(A) @ 10ft/3m]
No. of tones: 3
Volume control: On board potentiometer
Voltages DC: 24V dc (10-30V dc)
Reverse polarity diode protection on DC units.
Voltages AC: 115V ac; 230V ac
Ingress protection: GPH1: IP66 (UL Type 4/4X/13)
GPH2: IP54 (UL Type 13/3R)
Housing material: High impact UL94 V0 (f1) PC
Colour: Grey (RAL7038)
Cable entries: 2 x M20 clearance
Terminals: 22 – 12AWG (0.5-3mm²)
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: 0.35kg/0.77Ibs
*SPL data +/-3dB(A). Measured at optimum voltage
Tone 1 800/1000Hz @ 7Hz
Tone 2 Electro-mechanical type Buzzer tone
Tone 3 1200/500Hz @ 1Hz – DIN / PFEER P.T.A.P.

Current Consumption

Version: Voltage: Current:
24V dc 10-30V dc 62mA
24V ac 50/60Hz +/-10% 126mA
115V ac 50/60Hz +/-10% 40mA
230V ac 50/60Hz +/-10% 50mA

Part Codes

Version Part code:
GPH1S surface mount:
24V dc/ac GPH1SEDC24G
115V ac GPH1SEAC115G
230V ac GPH1SEAC230G
GPH2F flush mount:
24V dc/ac GPH2FEDC24G
115V ac GPH2FEAC115G
230V ac GPH2FEAC230G


  • UL & cULus approved: General signalling use.

Tone Table

Stage 1 WAV file Frequency Description.
T 1 /system/1/assets/files/000/000/392/392/68d5d1294/original/TF029.WAV 800/1000Hz @ 7Hz Sweeping
T 2 /system/1/assets/files/000/000/418/418/664b0e444/original/TF051.WAV Simulated buzzer sound
T 3 /system/1/assets/files/000/000/386/386/ceb4e488c/original/TF009.WAV 1200/500Hz @ 1Hz – DIN / PFEER P.T.A.P.
Country specific or custom tone configurations and alarm frequencies are available upon request.

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