Mechanical switches are found in electrical devices that we encounter in everyday use. A switch is by definition a mechanical component that can enable or disable the flow of electric current in an electric circuit. Due to the mechanical nature of the switch, contact parts wear out because of striking arcs and bouncing at contacts. Therefore, before launching the product, the manufacturer must obtain a certificate that guarantees the expected lifetime of the switch to the consumer. At SIQ the overall optimum operation of the mechanical switches are tested in accordance with the prescribed standards. Two tests have been performed, namely a heating test and an endurance test. In the heating test, the temperature of the switch parts is observed, which during the simulated intended use must not exceed a certain value. In the case of the endurance test, it is determined whether the switch exceeds a certain number of »makings« and »breakings«. Here a concrete example of the test results of the stick mixer switch is presented.