CM-IWx Insulation Monitoring Relays Technical Bulletin

This document discusses the CM-IWx series insulation monitoring relays from ABB Stotz-Kontakt, which use a pulsing measuring signal to detect symmetrical and unsymmetrical insulation faults in AC, DC, and mixed voltage systems. It also provides context on the growing role of renewable energy sources like wind and solar power in Germany, emphasizing the need for reliable insulation monitoring in unearthed (IT) systems to ensure supply security and prevent earth faults.