The F900-750 Isolator is designed to sense and isolate short circuits on the Firecom Analog Addressable Signaling Line Circuits (SLC). The isolator is placed at intervals on the SLC and ensures that, in case of a short circuit, only the section between the isolators will be affected. When the short circuit is removed, the isolator automatically restores power and data to the isolated section. A yellow LED illuminates if a short circuit is detected on either side of the isolator.