Model YBN-R/3(SCI) in white is a sensor mounting base featuring an integral short circuit isolator that will detect and isolate short circuits on the loop. When a short-circuit is detected during power up the unit will drop the power to the rest of the loop.
The YBN-R/3(SCI) is compatible with the ESP range of sensors and does not require a loop address. A remote fire LED facility is provided when a sensor is attached to the base.

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YBN-R/3(SCI) Datasheet