Ground-Fault Products for Solidly Grounded Systems
Ground-fault products are used to monitor grounded systems (TN and TT systems) for fault currents or residual currents. The sum of all conductors except the protective earth conductor is measured by means of measuring current transformers.
In general, ground-fault monitors (abbreviation RCM - residual current monitors) are used to send a message to the user even before reaching the shutdown threshold of the GFCI. ground-fault monitors detect deteriorations of the insulation level at an early stage and in a reliable way.