... running of the electrical equipment, in the AC circuit with the rated voltage value below 720V and ... of 50-60Hz, mainly used in combination with measure meters like ammeter, watt-hour meter, ... control relayu etc. The products comply with VDE 0414, BS7626 and IEC 44-1 standard ... requirements:a) Frequency: 50 - 60Hzb) Rated voltage: AC 660V2) Production standard: IEC1853) To test, control, display ...