Line Isolator Module

The TR-ISO is a SLC loop line isolator module for use with the Triga Series fire alarm control panels (FACPs). The TR-ISO acts as an automatic switch that opens when the line voltage on the signaling line circuit (SLC) loop drops below four volts. Isolator modules should be spaced between groups of sensors or modules in a loop to protect the rest of the loop. If a short occurs between any two isolators, then both isolators immediately switch to an open circuit state and isolate the devices between them. The remaining units on the SLC loop continue to fully operate. No more than 25 devices are recommended for each group.


The TR-ISO mounts directly into a 4” square electrical box. The box must have a minimum depth of 2-1/8”.


The TR-ISO is compatible with the following Triga Series FACPs:
• TR-2100R / ITR-2100B
• TR-2100ECSR / TR-2100ECSB
• TR-R2100R / TR-R2100B

Contact Us to Purchase

• Isolates short circuits on an SLC loop
• Protects the modules on the SLC loop so other devices continue to operate
• Panel controlled status LED that flashes green in normal state and is solid red in alarm
• Standard 4 inch electrical box mounting
• SEMS screws for easy wiring
• UL Listed

• FM approved


Dimensions: 4.5″ H x 4″ W x .25″ D ( 11.4 x 10.2 x .6cm)
Shipping Weight: 6.3oz (196g)


Operating Voltage: 15 – 32 VDC
Standby Current: 450 μA max
(not isolating; relay closed)
Isolation Current: 5mA max
Fault Detection Delay: 250ms min.
Fault Detection Threshold: 4V
Line Restoration Threshold: 7V


Operating Temperature: 32ºF-120ºF (0ºC – 49ºC)
Humidity: 10 to 93% non-condensing)


TR-ISO: Line Isolator Module


TR-SMB500: 4” Square Surface Mount Electrical Box

Contact Us

Subscribe to stay up to date on all the latest news

Click one of our representatives below to chat on WhatsApp.