In general, the Silent Knight SD500-LIM Line Isolator Module is compatible with Honeywell Silent Knight FACPs. Also, the SD500-LIM can be use on Style 7 (Class A), and Style 4 (Class B) wiring configurations. The SD500-LIM can Isolate a short circuit wiring fault on a SLC loop. Normally if a short on the SLC loop occurs, communication on the loop can be disrupted When isolator modules are used and a short occurs on the SLC loop, it will be detected as a trouble but all the SLC devices that are protected by a line isolator module will continue to operate. Besides, the Silent Knight SD500-LIM mounts in a standard dual gang or 4” square electrical box.