[en] In the case of two interacting spinor fields with equal masses, using the Lorentz type relativistic covariant gauges the first version of the Logunov-Tavkhelidze quasipotential approach is applied. The second order terms in the perturbation theory are obtained, and the quasipotentials in Dirac four-component and in Pauli two-component form are computed. The low-energy limit of the two-component form of the quasipotentials is calculated. In the case of Landau gauge and in the Fried-Yennie gauge the reconstruction of the full structure of the Breit potential is obtained