An electrical connector assembly comprising: - a first electrical connector, - a second electrical connector comprising: - a dielectric housing comprising a plurality of receptacles (5a, 5b), each on which having a wall and a locking member adapted to take a locking position, and an insertion position, wherein the plurality of receptacles are arranged in a network of rows, - a TPA member, adapted to move with respect to the dielectric housing between an intermediate position, and a locked position, - an electrical contact, having a locking feature, the contact being adapted to be inserted in the receptacle along an insertion direction, and movable in the receptacle:. from an outer position, wherein the contact does not mechanically influence the locking member,. through an intermediate position, wherein the contact deflects the locking member to its insertion position,. to a locked position, wherein the locking feature cooperates with the locking member of the housing in its locking position to lock the electrical contact in the housing, wherein the TPA member is adapted, in its intermediate position, to mechanically engage the first electrical connector to prevent the first and second electrical connectors to fully mate, and, in its locked position, to allow the first and second electrical connectors to fully mate, wherein, in the intermediate position of the contact, the contact prevents the TPA member from being moved from its intermediate position to its locked position with respect to the housing, and, in the locked position of the contact, the contact enables the TPA member to be moved from its intermediate position to its locked position with respect to the housing, wherein, in the locked position of the TPA member, the contact, the housing and the TPA member are adapted so that, upon moving the contact from its outer position toward its locked position, they mechanically cooperate to prevent the contact from being moved to its locked position, wherein the locking member has a first abutting surface and the TPA member has a second abutting surface, the first and second abutting surfaces facing one another in the locked position of the TPA member, wherein the TPA member comprises a finger extending between two contact receptacles (5a, 5b), which is inserted, in the locked position of the TPA member, in a corresponding cavity of the housing for preventing a movement of the TPA member with respect to the housing in a direction normal to the insertion direction, characterized in that the finger has a third abutting surface and the housing has a fourth abutting surface, the third and fourth abutting surfaces facing one another in the locked position of the TPA member so as to prevent a movement of the locking member from its locking position to its insertion position wherein, the third and fourth abutting surfaces (30,31) are disposed in a plane between two adjacent receptacles (5a, 5b). - a first electrical connector, - a second electrical connector comprising: - a dielectric housing comprising a plurality of receptacles (5a, 5b), each on which having a wall and a locking member adapted to take a locking position, and an insertion position, wherein the plurality of receptacles are arranged in a network of rows, - a TPA member, adapted to move with respect to the dielectric housing between an intermediate position, and a locked position, - an electrical contact, having a locking feature, the contact being adapted to be inserted in the receptacle along an insertion direction, and movable in the receptacle:. from an outer position, wherein the contact does not mechanically influence the locking member,. through an intermediate position, wherein the contact deflects the locking member to its insertion position,. to a locked position, wherein the locking feature cooperates with the locking member of the housing in its locking position to lock the electrical contact in the housing, - a dielectric housing comprising a plurality of receptacles (5a, 5b), each on which having a wall and a locking member adapted to take a locking position, and an insertion position, wherein the plurality of receptacles are arranged in a network of rows, - a TPA member, adapted to move with respect to the dielectric housing between an intermediate position, and a locked position, - an electrical contact, having a locking feature, the contact being adapted to be inserted in the receptacle along an insertion direction, and movable in the receptacle:. from an outer position, wherein the contact does not mechanically influence the locking member,. through an intermediate position, wherein the contact deflects the locking member to its insertion position,. to a locked position, wherein the locking feature cooperates with the locking member of the housing in its locking position to lock the electrical contact in the housing,. from an outer position, wherein the contact does not mechanically influence the locking member,. through an intermediate position, wherein the contact deflects the locking member to its insertion position,. to a locked position, wherein the locking feature cooperates with the locking member of the housing in its locking position to lock the electrical contact in the housing,