FireWatcher 851 Isolation Module

Alarm Isolation Module

FireWatcher 851

The isolator module FW851 isolates the short point on the signaling line circuit (SLC). The internal relay will be triggered to cut down the line power where the short trouble is detected.


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        The device LED will indicate the trouble condition by yellow steady on. A return to normal condition will cause the internal relay to normal position to restore the line power and the device LED indicator will return to the idle condition. The isolation module FW851 does not occupy an address on the Fire Alarm Control Panel’s SLC, so no address programming is required.

        The FW851 alarm module is a UL and ULC listed product according to UL864 and ULC-S527 for Fire Protective Signaling Systems for indoor use.

        • The isolator module nominal Voltage: 24VDC
        • Voltage Range: 15 to 28VDC
        • Standby Current: 1.6mA
        • Active Current: 10.8mA
        • Operating Temperature: 32°F to 120°F (0°C to 49°C)
        • Operating Humidity: 0% to 93% RH
        • Dimension: 120 mm (L) x 120 mm (W) x 45 mm (H)
        • Weight (with backbox) : 8.8 oz (249 g)
        • Mounting: FW800 Base
        • Mounting Location of the isolation module: Indoor Wall
        • Wiring Gauge: 12 to 18 AWG
        Ul approved alarm products
        UlC approved alarm products
        FM approved alarm products
        FCC approved alarm products

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