The most common disturbances in supply networks are short-term voltage dips. They can be caused by inrush currents from capacitors, motors or large transformers. However, most voltage dips are due to short circuits or ground faults in the grid, often many miles from where they occur. They usually last only a fraction of a second, but can lead to major problems. A voltage drop of 0.1 seconds, for example, has serious consequences for the manufacturing industry. The high degree of automation of individual processes and continuously running production lines requires an absolutely stable, trouble-free environment. This is the only way companies can ensure the highest product quality and a minimum of rejects. In the worst case, a malfunction lasting 100 ms will result in a production stoppage lasting hours. Systems for an uninterruptible power supply can be used to compensate for short-term voltage dips.