Grounding plays a vital role in electrical safety in Brazil. NBR 5410 outlines clear rules for earthing methods, ensuring that any fault current is safely discharged into the ground. Protective devices like circuit breakers and residual-current devices are mandatory in most. Why is a disconnecting circuit breaker used in Brazil? operation is difficult and can lead to operation errors. 13 A look at development. This article explores the crucial role of circuit breakers in substations, covering their fundamental functions, interruption processes, and the impact of transient recovery voltage (TRV) on system stability. In these segment we develop Owner's Engineering, Work Inspection, Basic and Executive Projects, Electrical Studies and commissioning of these sites. In a substation, the circuit breaker is the piece of equipment that matters most. This work aims to make a comparison between disconnector circuit breakers (DCB) and conventional circuit breakers, with the purpose of evaluating the feasibility of implantation in several installations in Brazil that follow procedures and regulations of the agents of the Brazilian electric sector. In these circumstances, circuit breakers, the equipment responsible for electric triggering of transmission lines, transformers, reactors and other equipment in substations are also being monitored.