A current transformer connector (10; 102) for connecting a current transformer of an electrical network to a protection relay via a current transformer data acquisition board (12; 104), the current transformer connector (10; 102) comprising first and second pairs (14, 20) of first and second current contacts (16, 18, 22, 24), each current contact pair (14, 20) being connectable in use to the current transformer so as to permit current flow from the electrical network through the current contact pairs (14, 20) to the protection relay, wherein each current contact pair (14, 20) is arranged to be in a short circuit configuration, wherein the current transformer connector (10; 102) is configured to receive, in use, said current transformer data acquisition board (12; 104) to permit current to flow from the current transformer of the electrical network through the first and second current contacts (16, 18, 22, 24) to the current transformer data acquisition board (12; 104), wherein the current transformer data acquisition board (12; 104) comprises at least one current channel member (106; 118) with a first current channel member portion and a second current channel member portion, wherein the first current channel member portion protrudes further from an edge of the current transformer data acquisition board (12; 104) than the second current channel member portion, and wherein the second current channel member portion extends from the edge of the current transformer data acquisition board (12; 104) by a first length (Li) and exhibits a first width (Wi) while the first current channel member portion extends from the second current channel member portion by a second length (L 2) and exhibits a second width (W 2), with the first width (W 1) being larger than the second width (W 2), and wherein the first current contact (16, 22) in each current contact pair (14, 20) is arranged to be independently moveable relative to the corresponding second current contact (18, 24) so that during initial insertion of the current transformer data acquisition board (12; 104) into the current transformer connector (10; 102) in use the first current contact of the first current contact pair is configured to separate from the second current contact of the first current contact pair due to the insertion of the first current channel member portion of the current channel member (106; 118) to permit breaking of the short circuit configuration of the first current contact pair and making of an electrical connection between the first current contact pair and the current transformer data acquisition board (12; 104) while the second current contact pair remains in the short circuit configuration, and so that during further insertion of the current transformer data acquisition board (12; 104) into the current transformer connector (10; 102) in use the first current contact of the second current contact pair is configured to separate from the second current contact of the second current contact pair due to the insertion of the second current channel member portion of the current channel member (106; 118) to permit breaking of the short circuit configuration of the second current contact pair.