Aircraft comprising at least one direct current electrical network, said network comprising nodes (N 1) linked together in pairs by branches (B k), each node being connected to at least two branches, said network being protected by a protection system comprising a plurality of protection elements (C j) mounted on the branches (B k), each protection element mounted on a branch (B k) comprising a central processing unit associated with a current sensor configured to measure the value of the intensity of the current in the branch (B k), and with a circuit breaking device controlled by the central processing unit to break the passage of the current, for each branch (B k) of the network linking two nodes (N j, N i), the protection system comprising two protection elements (C j, C i) mounted in series on the branch, where each protection element adjacent to a node is said to be associated with that node, and, for each protection element (C j, C i) of the protection system mounted on a branch (B k): • the current sensor is, in addition, configured to determine the direction of the current in the branch (B k) relative to the node (N j, N i) with which said protection element (C j, C i) is associated, the direction being determined out of a first direction in which the current enters into the branch (B k) by the node with which said protection element is associated, and a second direction in which the current leaves the branch (B k) by the node with which said protection element is associated; • the central processing unit is configured to select, as a function of the direction of the current determined by the current sensor, a threshold value, called selected threshold value, taken from a first value (S 1) or a second threshold value (S 2) greater than the first threshold value (S 1) in absolute value, and to compare the value of the intensity of the current to the selected threshold value; characterized in that the central processing unit of each protection element mounted on a branch (B k) is associated with a current limiter device controlled by said central processing unit to limit the current passing through the branch (B k), the current limiter device being bidirectional and configured to limit the current passing through the branch (B k) to the threshold value selected by the central processing unit. • the current sensor is, in addition, configured to determine the direction of the current in the branch (B k) relative to the node (N j, N i) with which said protection element (C j, C i) is associated, the direction being determined out of a first direction in which the current enters into the branch (B k) by the node with which said protection element is associated, and a second direction in which the current leaves the branch (B k) by the node with which said protection element is associated; • the central processing unit is configured to select, as a function of the direction of the current determined by the current sensor, a threshold value, called selected threshold value, taken from a first value (S 1) or a second threshold value (S 2) greater than the first threshold value (S 1) in absolute value, and to compare the value of the intensity of the current to the selected threshold value;