MR is the global market leader in power transformer regulation. MR tap changers and de-energized tap-changers adjust the transmission ratio of the primary to the secondary transformer winding in order to adapt to changing load ratios and, together with innovative sensors and electronics, thereby help to ensure a reliable power supply around the world. Other important parts of the business include the manufacture of composite hollow insulators, the manufacture and installation of active filters and compensation systems for ensuring the non-reactive operation of critical industrial applications, and the development of stationary and mobile test and measurement technology systems.