This paper describes the tests of high-voltage switches and their connection with valid standards. The basic parts of the switch and their role in operation, as well as the general principle of operation, are mentioned. Valid standards that prescribe all tests and generally everything related to high-voltage switches are listed. The differences between domestic and international standards are explained. All methods of circuit breaker testing are listed according to importance and frequency. The results of the routine testing of the high-voltage 123 kV circuit breaker in TS Kraljevac were presented.