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In recent years, earthquakes have caused more damage to non-structural components than to structures. Among the non-structural components, the electrical panel is one of the important devices used to maintain the functions of the facility. Therefore, it is very important to protect the electrical cabinet from earthquakes. Seismic performance can be improved while minimizing design changes by applying a seismic isolation system. FPS (friction pendulum system) is an isolation system that is capable of isolating structures from earthquakes by using the properties of a pendulum. The natural frequencies of the structures can be determined by designing the radius of curvature of the FPS. In this study, the seismic performance of an FPS with an overturn prevention device was evaluated through a 3-axis shaking table test. The seismic isolator was installed on an RTU panel used in hydroelectric power plants.