Silent Knight SK-ISO


Line Isolator Module

Availability: In Stock

  • Factory New
Brand: Silent Knight Part #: 34251 Categories: , Manufacturer Part #: SK-ISO


The SK-ISO is an addressable line isolator module for use with the Honeywell Silent Knight Series fire alarm control panels (FACPs). The SK-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.


Weight 0.2 lbs



Silent Knight

Production Status



  • Isolates short circuits on an SLC loop
  • Protects the devices on the SLC loop so other devices continue to operate
  • Standard 4 inch electrical box mounting
  • Bright white cover plate
  • SEMS screws for easy wiring
  • UL listed


SK-ISO Intelligent Fault Isolator Module
Silent Knight – Data Sheet