I300 fault isolator modules are designed for use with Fire-Lite® addressable fire alarm control panels (FACP's) and are intended to protect systems against wire-to-wire short circuits on SLC loops. Click on the link for more information: https://buildings.honeywell.com/us/en/products/by-category/fire-life-safety/i-o-modules/control-modules/i300-fault-isolator-module