Method for protecting an electrical energy distribution box, the electrical energy distribution box comprising a set of distribution bars intended to be connected between a generator and loads, each of the bars being able to transfer at least a part of the electrical energy passing through it to at least one other bar of the set of bars. According to this method, the incoming and outgoing currents of a single distribution bar are measured and a fault in the set of bars is detected on the basis of the currents measured in the said bar.