Abstract: A connector block for mounting plug-in type protector assemblies to protect telephone equipment from high voltage and current surges occurring on incoming telephone lines includes an elongated, relatively narrow mounting panel having a mounting end portion at either end. Disposed along the mounting panel is a plurality of socket groups arranged in a single column and a plurality of terminal hole groups arranged in a single column adjacent the socket groups, each of the terminal hole groups being associated with one of the socket groups. Each of the socket groups contains four line terminal contacts and a ground terminal contact. The ground terminal contact in each of the socket groups has a holder portion extending from a rear face of the mounting panel to which is coupled a single ground terminal bus bar. The ground terminal bus bar is coupled to grounding plates positioned adjacent the rear of each of the end portions.