FCL1 series residual current circuit breakers are mainly used in the electric distribution system AC 230/400V or less with rated current from 16A to 80A, for residential, functional and industrial buildings, providing protection against earth leakage, insulation fault and fire accident caused by direct or indirect contact to electric ferous parts ( including human or other animal getting a electric shock). These series RCCBs are in accordance with EN61008 and DIN VDE0664.