A.20mmB.75mmC.90mmD.125mm
A.電流二次回路應不小于4mm2,電壓二次回路應不小于2.5mm2B.電流二次回路應不小于2.5mm2,電壓二次回路應不小于1mm2C.電流二次回路應不小于1.5mm2,電壓二次回路應不小于0.5mm2D.可任意選擇