Abstract: The commissioning of distribution automation terminals (FTUs) can be performed using simulated circuit breakers. Although there are many types of popular analog circuit breakers, they basically only have the functions of simulating the opening and closing of switches. To address this limitation, an analog circuit breaker specifically designed for FTU verification has been developed. Compared to the commonly used simulated circuit breakers, the proposed device more accurately mimics real-world switch operations. It simulates key characteristics such as current flow initiation only after closing, voltage appearance on the opposite side post-closing, energy release from spring mechanisms during operation, and the re-storage of energy after a period of time. This enhanced simulation enables a more accurate validation of FTU functional logic under realistic operating conditions, ensuring that distribution automation terminals integrated into the power grid are free from functional defects.