This paper aims to present a guideline for modeling and normative instructions for short-circuit (SC) and transient recovery voltage (TRV) analysis of medium voltage circuit-breakers installed in a real industrial system. The Alternative Transient Program (ATP) through its graphical interface ATPDraw was used in the work. The criteria used for modeling the analyzed industrial system are presented in detail. For a better understanding of the technical information required for the modeling employed in TRV and SC studies, a set of detailed and typical data used is presented in order to contribute to the reproduction of this case study in other expanding industrial power systems. The instructions for SC and TRV evaluation of circuit-breakers are based on the limits described by IEC standards and other references. The results are presented by discussing the effects of industrial expansion on the evaluated medium-voltage circuit breakers. •Normative modeling criteria for SC and TRV studies based on detailed real data.•Significant changes in industrial systems justify the updating of SC and TRV studies.•The violation of TRV/RRRV limits of CB is not only linked to the SC power increase.