https://buildings.honeywell.com/us/en/products/by-category/fire-life-safety/sensors-and-detectors/conventional-detectors/bases/b224bi-detector-isolator-base
B224BI Detector Isolator Base|Honeywell Building Automation
B224BI Plug-in Isolator Detector Bases prevent an entire communications loop from being disabled when a short circuit occurs.
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