JEAN MÜLLER products for smart grids are oriented close to the needs of power engineering. Security is at the top of the list, thus, for example, Instead of using piercing terminals use of fused voltage taps in NH fuse-switch-disconnectors. Device carriers for mounting on the 185mm busbar system allow the installation of components, such as PLC modems or measurement technology, which are usually not used in cable distribution cabinets. A new product is the MCU318 measuring and communication unit for the detection of up to 18 currents and the supply voltage and their derived variables. Data connection via GSM and measurement technology based on Rogowski coils allow easy retrofitting. The IP54 housing ensures optimal protection of the electronics used.