In order to meet the requirements of device standards, the demands of daily use in harsh environments with dust and splash water, or cleaning, devices must in many cases offer a protection rating higher than IP 40. Components such as power plug connections in accordance with IEC 60320, switches, operation elements or display elements, wich have increased impermeability and allow the same with the device housing, facilitate the engineer while designing a corresponding device. This applies to components on the front as well as those on the back of the device.