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The KFDO-CS-EX2.51P is an isolated barrier used for intrinsic safety applications. It transfers DC signals from fire alarms, smoke alarms and temperature sensors in hazardous areas. It can also be used to control I/P converters, power solenoids, LEDs and audible alarms. Reverse polarity protection prevents damage to the isolator caused by faulty wiring. Since this isolator is loop powered, use the technical data to verify that proper voltage is available to the field devices.