This paper presents a new algorithm to solve the problem of reconfiguration of distribution networks using Improved Selective Binary Particle Swarm Optimization (IS-BPSO). The proposed method presents a new sigmoid function capable of promoting a control in the rate of change of the particles and improving the convergence of the results. The proposed algorithm aims to reduce power losses in distribution networks, it was applied in two energy distribution test systems, commonly found in the literature, the 33-Bus and 94-nodes systems. The results of the simulation show that the proposed method is very efficient and guarantees the achievement of the global optimum.