Economic, environmental and social reasons changed in the last years the one way development of new and better combustion engine based powertrain solutions in the automotive environment. Over the years regulations with the target to reduce the CO2 emissions forced the OEMs to look for alternative techniques to reduce the fuel consumption of ICE (Integrated Combustion Engine) or even to replace the engine by an electrical drive train. From 2021 onwards the vehicle emission regulation directs a limit of 95gCO2/km (today 130g/km) which cannot be achieved with a further improvement of the ICE efficiency. An additional CO2 saving can be achieved by adding an electrical motor to support the various operational states of a car and which allows a reoccupation of energy into a battery. This concept led to the development of different types of hybrid electrical vehicles, such as plug-in hybrid electric vehicles, full hybrid electric vehicles and mild hybrid electric vehicles (MHEV). Depending on the type of hybridization a CO2 saving of up to 50% can be reached. From the commercial point of view the MHEV is the most economical type where the invest per saved gram of CO2 is the lowest. The additional applications in a MHEV typically require power compared to applications in a car with just an ICE. To enable and supply these applications used in a MHEV, a higher voltage level is required. As a compromise (trade off) between safety specifications and the power needed an additional power network at 48V was established. In 2016 the first production car with a 48V system architecture entered the market and more and more OEM offer mild hybrid models with a 48V architecture.