The System Sensor B500BI isolator base is designed for use with all System Sensor 200 addressable detectors. The B500BI isolator base prevents an entire 
communications loop from being disabled when a short circuit occurs.
There is an automatic switch in the product that opens when the line voltage drops below 4 volts.
It is used to isolate the detector which is connected in the communication line.
In the event of a short circuit condition on the 
communication line in the detector, the isolator base will open its switch and disconnect the detector from the communication line.
When the short condition is removed and the line 
voltage rises above 7 volts, the isolator base will detect the removal of the fault condition and automatically 
reconnect the isolated detector.

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