Wound primary current transformers Type : JM Series Technical data Highest voltage for equipment 0,72 kV Power-frequency withstand voltage 3 kV Primary current Ipn 50 to 600 A Secondary current Isn 5 or 1 A Frequency 50 or 60 Hz Rated output 1 to 60 VA Accuracy class 0,5 - 1 - 3 Security factor 5 to 30 Continuous thermal current 1,2 Ipn Short-time thermal current Ith 60 Ipn .1s Dynamic current Idyn 2,5 Ith Insulation class E Ambient temperature -25°C to + 40°C Standards IEC 60044 - IEC 61869 - NF C4250 VDE 0414 - BS7626