Analog Addressable SLC Fault Isolator Module for FX Series Fire Alarm Systems
Kidde Commercial

Analog Addressable SLC Fault Isolator Module for FX Series Fire Alarm Systems

SKU KD-FX-ISO

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The FX-ISO keeps the SLC loop online when a wire-to-wire short would otherwise take down the entire circuit. It monitors line voltages continuously and opens the loop at the fault point, isolating the short between the two nearest isolator modules while the rest of the system stays fully operational. One address per module, set with a screwdriver on the front-face rotary switches.

Built for the fire alarm installer

Drop the FX-ISO into any Kidde FX Series intelligent fire alarm system using standard SLC wiring. No additional power supply, no special cable - the module draws directly from the SLC loop at 175 A standby. Address it via the rotary TENS and ONES dials, wire to P1 and P2 screw terminals, and mount on a standard 4" square electrical box. Compatible with all KIR detectors and FX modules on the loop. UL Listed.

Key features

  • Automatic fault isolation: detects wire-to-wire shorts and isolates the faulted SLC segment without taking down the rest of the Class A loop
  • Loop-powered operation: no auxiliary power supply required - draws directly from the SLC at 175 A standby, 200 A activated
  • Rotary address switches: set TENS (0-12) and ONES (0-9) with a screwdriver for up to 127 addresses on a 1000-point panel
  • Bicolor LED status: flashing green for normal operation, flashing red when actively isolating a fault
  • Standard box mounting: fits 4" square x 2-1/2" deep 2-gang box or standard 4" square box 1-1/2" deep
  • Universal FX compatibility: works with all KIR detectors and FX modules on the SLC loop

System requirements

Requires a Kidde FX Series intelligent fire alarm control panel (64-point or 1000-point). Install on a Class A SLC loop with maximum circuit resistance of 6 ohms between isolator modules. Wire with 12-18 AWG (16 and 18 AWG preferred) per NFPA 72 and CAN/ULC-S524.

Specifications

SKUKD-FX-ISO
BrandKidde Commercial
Form factorAnalog addressable SLC isolator module
CommunicationSLC loop (20 V peak-to-peak max)
Power inputSLC loop-powered (no auxiliary power required)
Current draw - standby175 μA
Current draw - activated200 μA
Module address range01-64 (64-point panel), 01-127 (1000-point panel)
Compatible devicesAll KIR detectors and FX modules
Ground fault impedance10 kΩ
Max circuit resistance between isolators6 Ω
Operating temp32°F to 120°F (0°C to 49°C)
Operating humidity0-93% RH, noncondensing at 90°F (32°C)
Storage temp-4°F to 140°F (-20°C to 60°C)
Compatible electrical boxes4" square x 2-1/2" deep 2-gang box; standard 4" square box 1-1/2" deep
Wire size12, 14, 16, or 18 AWG (16 and 18 AWG preferred)
LED indicatorsBicolor - flashing green (normal), flashing red (active)
Ship weight0.50 lbs (0.23 kg)
ComplianceUL Listed

Documents and resources

FAQs

What does the FX-ISO do when it detects a short on the SLC loop?
It monitors SLC line voltages and opens the loop at the fault point when a wire-to-wire short is detected. The short is isolated between the two nearest isolator modules while the rest of the Class A loop stays operational.
Does the FX-ISO require a separate power supply?
No. The module is loop-powered, drawing 175 μA in standby and 200 μA when activated. It connects directly to the SLC with no auxiliary power wiring needed.
How do I set the module address?
Use the two rotary switches on the front of the module. The TENS dial selects 0-12 and the ONES dial selects 0-9, giving you an address range of 01-127 on a 1000-point panel or 01-64 on a 64-point panel. One address per module.
Which Kidde fire alarm panels is the FX-ISO compatible with?
The FX-ISO works with all Kidde FX Series intelligent fire alarm control panels, both 64-point and 1000-point models. It is compatible with all KIR detectors and FX modules on the SLC loop.
What is the maximum circuit resistance allowed between isolator modules?
6 ohms. Wire with 12-18 AWG (16 and 18 AWG preferred) per NFPA 72 and CAN/ULC-S524. Place isolator modules at strategic points along the SLC loop so a fault between any two isolators affects the fewest possible devices.
All FX Series