... Schneider; Schneider top agents in China, with PRD,PRF,PRI series. I'll be safe with it.Schneider surge protector(PRD ... ,PRF,PRI)PRC - Analogue or digital series-mounted telephone line d1 protection. - Compatible XDSL (including ADSL). - Imax. 18 kA ... - Can be used on any DC or AC low current line: supply, analogue signals, binary state of the sensors, digital data ...