The requirements of modern systems and plants are becoming more and more complex through increased amounts of power and microelectronics. BLOCK provides a comprehensive range of reactors and filters here in order to guarantee reliability, efficiency and freedom from interference, including within the framework of Industry 4.0. The range includes filtering of harmonic distortions and high-frequency conducted and radiated interference emissions. The use of Power Quality products protects motor insulation and increases system efficiency by reducing leakage currents.