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Phone: 800-231-1414 or 631-231-1414 Fax: 631-231-1498 E-Mail:
Grill Type Hazardous Location Horn
Diode Polarized, Outdoor Rated, NEMA Type 4X
Edwards is a registered trademark of UTC Fire & Security


The Edwards 878DEX AC & 879DEX DC 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. May also be used for unsupervised signaling applications

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.


Diode polarized
Corrosion resistant heat flowed epoxy finish
Low current drain
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 (Outdoor Type 4X applies to general signaling use in non-fire alarm applications)
CSA version available
Wide operating voltage range: -20% to +10% of nominal voltage
Power connection wires embedded in sealing compound
Click for Spec Sheet
878DEX-N5 EDWARDS AdaptaHorn Hazardous Location Grille Type Horn,  120VAC, Diode Polarized
879DEX-G1 EDWARDS AdaptaHorn Hazardous Location Grille Type Horn,  24VDC, Diode Polarized
889D-AW EDWARDS AdaptaHorn Hazardous Location Grille Type Horn,  24VDC, Diode Polarized, RED
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This page was last updated October 20, 2014

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