SP5-RJ11 series surge protective device (hereinafter brief as SPD), suitable for circuit of MODEM, DDN special line, FAX, TELEPHONE etc. Used to prevent the lightning surge and network over voltage damage to the equipment.  

Installed at the data cable port between LPZ1 to LPZ3 zone, suitable for MODEM(ISDN, ADSL), DDN Special line, Fax, telephone terminal equipment with RJ11 connection port, can as per customer request to combine multi-poles or multi-way signal lightning protective box.