A connector block with solderless, non-screwed and stripping-free terminals having a polytropic air gap for terminating communication cables, comprising a housing upper half and a housing lower half, characterized in that the connector block (1) receives angular pairs of terminal elements (2, 3) respectively rotated about 180.degree. in separate receptacles (13) of the housing upper half (11) and the housing lower half (11) in plugged-in relationship, that each of said terminal elements (2, 3) in addition to a terminal contact (2b, 3b) includes a centre contact (2a, 3a) with a semi-circular extension (2a') integrally formed therewith on the underside (2') thereof, that centrally of the longitudinal axis of the connector block (1) within the housing lower half (11) a groove (12a) is formed including plural receptacles (12b, 12c) formed with two different stepped shoulders (12b', 12c'), that an earth bar (4) rotatable about 180.degree. is adapted to be inserted into said groove (12a) at two different levels, and that the earth bar (4) is formed with tabs (4a) engaging in said receptacles (12b, 12c).