A.85~110% B.110~125% C.125~144% D.144~160%
A.壓縮空氣負荷開關(guān) B.油負荷開關(guān) C.真空負荷開關(guān) D.氮氣負荷開關(guān)
A.電磁干擾 B.過電壓 C.結(jié)電阻 D.局部放電