Federal Signal

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Audible Devices

50GC SelecTone® Audible Signaling Device

  • Available in 24VAC/24VDC and 120VAC
  • Solid-state circuitry
  • Built-in gain control
  • Produces 64dBa to 88dBa @ 10' (74dBa to 98dBa @ 1m)
  • Flush or surface mount
  • Type 3R enclosure
  • UL and cUL Listed, CSFM Approved

Federal Signal's Model 50GC SelecTone® Speaker Amplifier is designed to produce crisp, clear tones, digital voice messages and live public address.

In the Model 50GC a short, folded re-entrant horn is interposed between the diaphragm and surrounding air space. This design provides optimal dB output and very good frequency response.

The 50GC is UL Listed. It has been designed, tested and approved for use in Type 3R applications. When installed with the Model WB Weatherproof Backbox, the 50GC is suitable for use outdoors.

Internal gain control allows output adjustment from 64dBa to a maximum of 88dBa at 10 feet.

SelecTone Speaker Amplifiers are used individually or as part of a plant-wide emergency notification system. The Model UTM Universal Tone Module, with 32 tones, or the TM33 Custom Tone Module is plugged into a single SelecTone Speaker Amplifier for stand-alone use or into a SelecTone Command Unit for plant-wide signaling.

For plant-wide signaling, a Connector Kit is installed into each SelecTone Speaker Amplifier and wired to a central controller. SelecTone Command Units and CommCenter® Digital Message Centers broadcast tones, voice messages, melodies and live public address to an unlimited number of SelecTone Speaker Amplifiers.

The compact size and attractive appearance of the Model 50GC make it ideal for use in offices, hallways, reception, and plant areas where ambient noise levels are not exceedingly high, and even sound dispersal is desired. Emergency signaling and paging are common applications.

Special Considerations

  • Specify Tone Module for stand alone operation
    • Universal Tone Module (UTM)
    • Custom Tone Module (TM33)
  • Specify Connector Kit (sold separately) for use in systems (Call us for system design assistance)
    • 25Vrms Connector Kit (AM25CK)
    • 70Vrms Connector Kit (AM70CK)
  • Specify accessories, see list below


Part # Description Ship Weight Net Weight  
50GC-024BG SelecTone® signal, 24VAC/DC, 4" square, beige 2.2 lbs. 1.7 lbs. Add to Quote >
50GC-120BG SelecTone® signal, 120VAC, 4" square, beige 2.2 lbs. 1.7 lbs. Add to Quote >


Part # Description Ship Weight  
WB Box, weatherproof, gray 1.15 lbs. Add to Quote >
FG Grille, flush mount 0.75 lbs. Add to Quote >
FBL Deep wall box for flush mount 1.8 lbs. Add to Quote >

Replacement Parts

Description Part #  
Accessory Kit (Trim Ring and Gasket) K8476123A Add to Quote >


Listed By Underwriter's Laboratory (ULus)
Speakers UEAY-E4813.pdf
Audible signal appliance, general signal UCST_E4813.pdf
Listed By Underwriter's Laboratory For Use In Canada (cUL)
Audible signal appliance, general signal, certified for Canada UCST7_E4813.pdf
Speakers certified for Canada UEAY7-E4813.pdf
Listed By California State Fire Marshall (CSFM)
Audible signal device 7135_0811_003.pdf





24VAC 50/60Hz

120VAC 50/60Hz



Optional Weatherproof Backbox - (Model WB)

Operating Current

0.07 Amps at 24VDC

0.22 Amps at 24VAC

0.04 Amps at 120VAC

Standby Current

0.025 Amps at 24VDC

0.095 Amps at 24VAC

0.027 Amps at 120VAC

Decibel Output

88 at 10 Feet

98 at 1 Meter

Operating Temperature Min. -31 F
Operating Temperature Max. 161 F
Enclosure Rating Type 3R
Height 4.5 IN
Width 4.5 IN
Depth 3.18 IN
Federal Signal distributed by Gross Automation - Brookfield, WI - Phone: (262) 252-1600 - Fax: (262) 252-1616
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