steelTalks is a monthly series on topics of interest to the global steel community. The lectures are presented in a webinar format with a guest lecturer. In this new edition of steelTalks in Spanish we will try to review general concepts about the prequalified moment connection RBS (Reduced Beam Section), going through a quick historical contextualisation, the normative base (ASIC 358-16). In addition, we will show an application example in the Ed project. ACAP, in Santiago de los Caballeros (Dominican Republic).