The present invention relates to a self-locking wire device being adapted to receive at least one wire according to at least one insertion direction, the self-locking device comprises a housing being electrically insulating and a locking element being electrically conductive. The locking element comprises one or more bases extending all along an inner side of the housing and at least one locking portion being configured in a way to block any movement of the at least one wire in a direction being opposite to the insertion direction.