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878DEX / 879DEX / 888D & 889D Series

AdaptaHorn Grille Type Hazardous Location Horn Diode Polarized


  • Diode polarized

  • Corrosion resistant heat flowed epoxy finish

  • Low current drain

  • Available in grey or red

The Edwards 878DEX, 879DEX, 888D and 889D series are diode polarized, heavy-duty, high decibel, vibrating horn signals. They are intended for use in hazardous locations requiring electrical supervision of signaling circuit field wiring. The 878DEX and 879DEX are for non-fire alarm applications and also have a NEMA type 4X rating and may be used outdoors (recommended above temperatures of +25F). 

Two mounting brackets are provided on either side of the unit for wall mounting. The housing is tapped on one side for 3/4" (19mm) conduit to allow for field wiring installation.

For use in dusty, hazardous atmospheres where a distinctive, urgent signal is required. Typical applications include use in mines, petroleum plants, gas plants, grain elevators, flour mills, paper mills, textile plants and tankers.

878DEX / 879DEX / 888D & 889D Series

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Catalog Numbers

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Catalog Number

Polarized Grill Type Hazardous Location Vibrating Horn
120VAC 50/60Hz, 0.13A


Hazardous Location Adaptahorn
24 VDC, 0.16 A


AdaptaHorn Grille Type Hazardous Location Horn
120V AC


AdaptaHorn Grille Type Hazardous Location Horn
20-24V DC, 0.16A




Agency Approvals

UL Listed for Class I, Division 1 and 2, Groups B, C, and D; Class II, Division 1 and 2, Groups E, F, and G; and Class III locations, UL Listed for outdoor locations NEMA Type 4X Rated (878DEX and 879DEX only)

  • Wide operating voltage range -20% to +10% of nominal voltage
  • Power connection wires embedded in sealing compound

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