Description Product Reviews Porta Systems 525 25 Pair Protector Block 66 Termination with Modules 25 Pair telephone line primary protector with 25 Avaya Solid State 7AB0 5-pin modules. Used to protect central office lines coming into a building against surges and sneak current. Features & Benefits UL 497 Listed for primary protection Utilizes industry standard 5-pin protector modules 66 IDC termination input and output High-impact, fire retardant housing Units can be cascaded to provide for expansion Compact, lightweight design AQL Incoming Inspection Process ISO 9001:2000 registered facility Operating Temperature: -13F to 149F(-25C to 65C) We carry the complete line of Porta Systems protectors and modules if you do not see the item you are looking for please call. 0 Reviews Hide Reviews Product Reviews