Intelligent Fire Alarm System Isolator Module DT851 Intelligent Fire Alarm System Isolator Module DT851

The UL listed Intelligent Fire Alarm System. D-TECTRON fire alarm systems can be configured with just a few devices for small size building applications, or networked with many devices to protect a large campus or a high-rise building. Simply add additional peripheral equipment to suit the application. Our advanced technology delivers supports the installers to do complete installation easily through simple steps. The inherent fault-tolerant characteristics of Analog/Address- able Technology boosts the reliability of D-TECTRON fire alarm systems. When combined with D-TECTRON smoke and heat detectors, these systems deliver a level of reliability and dependability for both small to medium size applications.

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Product Description

The DT851 relay module provides two control relay outputs which will be activated simultaneously. When the outputs are activated, the device LED will indicate the event condition by red blinking. A return to normal condition will cause the event to disappear and the device LED indicator will return to the red idle condition. The DT851 is an intelligent addressable module and takes one address on the Signaling Line Circuit (SLC) or Data Communication Link (DCL) of the fire alarm control panel. It is a UL listed product according to UL864 for Fire Protective Signaling Systems for indoor use.

Nominal Voltage24VDC
Voltage Range15 to 28VDC
Standby Current1.6mA
Active Current 10.8mA
Operating Temperature32˚F to 120˚F (0˚C to 49˚C)
Operating Humidity0% to 93% RH
MountingDT800 base
Dimension120 mm (L) x 120 mm (W) x 45 mm (H)
Weight (with backbox)8.8 oz (249 g)
Wiring Gauge12 to 18 AWG
Mounting LocationIndoor Wall


The D-TECTRON Fire Alarm System complies with the following UL Standards and NFPA 72, International Building Code (IBC), 

Fire Alarm System requirements: UL 864, 10th Edition, UL268\UL521\UL1638\UL1971\UL464\UL38 

FM Approval Ongoing


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