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5520D Series Horn/Siren Combination

D2 Class low current, high performance


  • 124dB audible signal at 1m (114dB @ 10ft.)

  • Suitable for outdoor applications using 349 Back Box

  • Switchable horn or siren or horn models

  • Easy mounting plate speeds installation

  • Diode polorized for supervised circuits (5520D)

  • Horn frequency of 1.1 KHz

  • Siren frequency rises and falls from 600 to 1300 Hz every 3 seconds

  • Speaker swivels 180° horizontally and 90° vertically

5520D series Duotronic signals are 24 Vdc diode-polarized, heavy duty, high-decibel signaling appliances for use in fire alarm applications where a supervised signal is required.  Colored sage gray, 5520D Series signals will function as either a horn or siren by setting an internal tamper-proof switch.

The 5520D Horn/Siren has no moving parts or contacts to wear out.  It requires no maintenance or lubrication.  The horn/siren operates with very low current consumption and does not require extra current on start-up.  The horn's predominant frequency is 1.1 kHz.  When horn output is selected, the frequency rises and falls from 300 to 3000 Hz every 3 seconds.

Once mounted, the horn/siren switch is tamperproof.  The horn is suitable for coded applications, while the siren is not.  The 5520D Series can be made suitable for outdoor weatherproof applications by adding the catalog number 349 Backbox.

5520D signals are ideal for indoor or outdoor applications including schools, factories, commercial occupancies, and lumber yards.  They can be used where standard bells or horns are not satisfactory, particularly in areas of high noise level.  The unit will function as a Horn or Siren with just the flick of a switch.

5520D Series Horn/Siren Combination

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Catalog Numbers

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Catalog Number

Duotronic Electronic Signal, Horn/Siren, Diode Polarized
24 VDC, 0.35 A


Duotronic Electronic Signal, Horn/Siren, Diode Polarized
120 VAC 50/60 Hz, 0.35 A


Weatherproof Backbox




Agency Approvals

  • UL Listed

  • FM Approved Audible Notification Appliances Standard 3151-3152

  • Speaker swivels 180 horizontally and 90 vertically
  • Horn frequency - 1.1KHz
  • Siren frequency - rises and falls from 600 to 1300 Hz every 3 seconds

(click to enlarge)