A residual current monitoring device (also called a residual current monitor) is used to monitor grounded networks (TN and TT systems) for residual currents or residual currents. With the help of measuring current transformers, the sum of the currents of all conductors is measured, except for the protective conductor.
Residual current monitoring devices (abbreviation RCM, Residual Current Monitor) are usually used to give the user a message before the switch-off threshold of an RCD is reached. You can detect deteriorations in the isolation level early and reliably.
