CTG210 is a core balance transformer designed to detect the difference in current flow on lines running through its coil, enabling identification of potentially hazardous current leaks on electric loads. It features a 210 mm internal diameter and operates on either single-phase or three-phase mains with a current transformer ratio of 1000/1 and frequency range of 50 to 60 Hz. The CTG210 has a nominal current rating of 400 A, short-term thermal current of 400 A, and overload current capacity of 2400 A, with a maximum system voltage of 720 VAC and rated insulation level of 3 kVAC. It is typically used on electric motors, pumps, and devices installed in metallic structures, and is approved for use with Carlo Gavazzi DEA71 and DEB71 earth leakage monitoring relays to provide comprehensive protection against electrical hazards.