Federal Signal

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Audible Devices

55 Resonating Horn

  • Resonated column of air generates sound
  • Produces 105dBa @ 10' (115dBa @ 1m)
  • Indoor/outdoor use
  • FM Approved
  • Model 55 (120VAC) is UL Listed and CSA Certified

The Federal Signal Models 55 and 56 are electric horns that produce sound by means of a diaphragm, which resonates a column of air. Because the output is greater than that of a vibrating horn resonating horns can be used wherever a louder, more powerful signal is required.

Both models feature corrosion-resistant cast aluminum housings with a brass projector. These projectors are designed to match the frequency of the vibrating diaphragm to produce a smooth musical tone. The housings are tapped for 1/2-inch conduit (swivel bracket included).

Models 55 and 56 are finished in gray enamel and equipped with a straight projector. These weatherproof horns are water- and dust-tight when installed with conduit.

Model 55 is also UL (Underwriters Laboratories) Listed and CSA (Canadian Standards Association) Certified for indoor/outdoor use. Both models are FM Approved. Models 55 and 56 have a duty cycle of five minutes on, five minutes off.

Models 55 and 56 are ideal for both indoor and outdoor use. They require minimum maintenance; their rugged designs seal out corrosive dust and vapors. Both models have sufficient output to penetrate through high ambient noise levels.


Part # Description Ship Weight Net Weight  
55-024-1 Horn, 24VAC, resonating 6.2 lbs. 5 lbs. Add to Quote >
55-120-1 Horn, 120VAC, resonating 6.2 lbs. 5 lbs. Add to Quote >


Part # Description Ship Weight  
K8283C071-0G Projector   Add to Quote >
K8233A046-0G Mounting Bracket Assy Kit   Add to Quote >
K8233A036 Bulk Head Mounting Kit   Add to Quote >

Replacement Parts

Description Part #  
Straight Projector K8283C071-0G Add to Quote >
Mounting Bracket Accessory Kit K8233A046-0G Add to Quote >
Bulk Head Mounting Kit K8233A036 Add to Quote >
Coil, 120VAC KFC456 Add to Quote >


Listed By Underwriter's Laboratory (ULus)
Audible signal appliance, general signal UCST_E4813.pdf
Certified by CSA International
Signal appliances, audible 4812_04.pdf
Factory Mutual (FM)
FM Approval Guide FM_Approval_Guide.pdf




24VAC 60Hz

120VAC 60Hz

Mount Swivel Bracket
Operating Current

3.0 Amps at 24VAC

0.75 Amps at 120VAC

Operating Temperature Min. -35 F
Operating Temperature Max. 150 F
Decibel Output

105 at 10 Feet

115 at 1 Meter

Duty Cycle 5 minutes ON, 5 minutes OFF
Height 8 IN
Width 8 IN
Length 19.75 IN
Federal Signal distributed by Gross Automation - Brookfield, WI - Phone: (262) 252-1600 - Fax: (262) 252-1616
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