Maple Armor FW2851 Short-Circuit Fault Isolator Module (Automatic Loop Isolation)

Description

The Maple Armor FW2851 Fault Isolator Module is an essential life-safety device designed to maintain uninterrupted communication across addressable fire detection networks.

Operating seamlessly on the Signaling Line Circuit (SLC) of Maple Armor FW2105 and FW2107 control panels, this module does not require a digital loop address. It continuously monitors signaling loop voltage and automatically isolates short-circuited wire runs.

Fully compliant with UL 864 10th Edition, CAN/ULC-S524, and CAN/ULC-S527 standards, the Maple Armor FW2851 Fault Isolator Module ensures that a single wiring fault on a floor or zone will never compromise communication with devices across the rest of the facility.

Technical Specifications Table

High-Speed Circuit Protection & Automated Loop Restoration

The primary engineering function of the Maple Armor FW2851 Fault Isolator Module is to divide an addressable Signaling Line Circuit into electrically segregated protection zones.

When a severe ground fault, physical wire pinch, or dead short occurs on a field cable, loop voltage drops rapidly. The Maple Armor FW2851 Fault Isolator Module senses this drop below 2.53 V and instantly opens its internal solid-state switches, severing the compromised line segment from the network.

This isolation prevents system-wide brownouts and allows every detector and module outside the faulted zone to maintain full communication with the central panel. Once field technicians clear the physical fault, the module automatically reconnects the circuit without requiring manual resetting at the main panel.

• Automatic Fault Containment: Instantly isolates damaged cable sections to prevent whole-loop failure during construction or fire emergencies.
• Zero Address Consumption: Adds robust hardware isolation without reducing the 252-device software limit on your panel loops.
• Automatic Self-Restoration: Reconnects the isolated branch automatically the moment wire faults are resolved on-site.
• Visual Fault Localization: Bright front LED illuminates steady red on active isolation, speeding up troubleshooting for field engineers.

Frequently Asked Questions (FAQ)

Q1: Does the Maple Armor FW2851 Fault Isolator Module consume an address on the fire alarm panel?
A: No. The FW2851 is an unaddressed hardware protection device. It does not occupy any of the 252 available addresses on the Maple Armor SLC loop.

Q2: How does the isolator module respond when a short circuit occurs on the loop?
A: If the loop voltage drops below 2.53 V due to a short circuit, the module automatically opens the circuit to isolate the faulted wire run, keeping all upstream devices operating normally.

Q3: Does the FW2851 require a manual panel reset after the wiring fault is fixed?
A: No. The module features automatic self-restoration. As soon as the short circuit or wiring fault is physically repaired, the isolator automatically closes its contacts to restore complete loop continuity.

Q4: Where should isolator modules be positioned in a fire alarm installation?
A: In accordance with NFPA 72 and CAN/ULC-S524 standards, isolator modules are typically installed at transitions between building floors, between separate fire barrier zones, or after every 20 to 25 addressable devices.

Q5: Which backboxes are compatible with the FW2851 isolator module?
A: It mounts flush to standard North American 4-inch square electrical junction boxes (minimum 2-1/8 inch depth) or surface mounts using Maple Armor FW800/FW801 plastic boxes.

Q6: Which fire alarm control panels are compatible with this isolator?
A: It is fully compatible with Maple Armor Series 2 control panels, including the FW2105 standard multi-loop panel and the FW2107 dual-hazard releasing panel.