This product offers efficient protection of ADSL and analogical telephone lines, which contain co-ordinated protection for 2 pair of lines. For this type of line, both common and differential protection is offered. It also allows the connection of 2 pairs of lines whicb have a very small size (0,75 DIN modules). It offers protection not only for telephone lines but also for the digital and analogical equipments connected to lines of modem of fax. Pluggabke modules are provided for easier substitution in cases of connection failure where disconnecting the wiring is not needed. When the module is substituted, no interruptions are suffered by the lines. There is also a radiofrequency receptor so that maintenence work can be done only with issuer equipment. The LED flickers green when the RF SPD tester is applied and the protector starts working. If in any case the cartridge is damaged then the LED does not flick. The earthing is implemented through a metallic sheet opposite to the DIN rail fixing.