... .With DC immunity upon IEC 62053-21 standard (current transformer, precision CT,transformer) Current Transformer NRC05 CharacteristicsValuesOperating frequency50/60HzOperating temperature-25 ~ 75oCRelative ... Itest I max /Burden resistor Rb5Ω, 10Ω, 20ΩAccurate operating current range5% I p ~ I maxAccuracy class 0.1%, 0.2 ...