KITED SNAP-IT " SERIES READ AND UNDERSTAND ALL INSTRUCTIONS If using DTK—SI—xxxA device, please take note that this device is an over voltage and over current protector and is intended for indoor use on a UL Listed 66 type block which is located on the equipment side of a UL Listed primary protector, If using DTK—SI—xxxB device, please take note that this device is an over voltage protector ond is intended for indoor use on low power Communication Loop Circuits which have been isolated from the Public Switc