The B224BI isolates any part of a loop that has a short from the rest of the loop. The base also automatically restores the entire loop when the cause of the short circuit is corrected. The B224BI is a 6” mounting base with a built-in isolator for SK series detectors intended for use with the Honeywell Silent Knight series fire alarm control panels (FACPs). The B224BI prevents an entire communication loop from being disabled when a short circuit occurs.