Description Product Reviews 110 connector input and output protects up to 100 lines, also available in 25 pair (1880ENA1/NSC-25), 50 pair (1880ENA1/NSC-50) and 12 pair (1880ENA1/NSC-12) configuration ideal for small PBX and interconnect installations stackable to allow for future service expansion external ground post for extending metallic frame to building ground equipped with an internal fuse link accommodates industry standard 5 pin protection modules designed to exceed the requirements set forth in Underwriters Laboratories UL497 0 Reviews Hide Reviews Product Reviews