JN22-40.5/31.5 户内高压接地开关 Indoor High Voltage Grounding Switch 外形及安装尺寸 (mm) - ) # # . 极间距 B H L 280 750 1180 300 790 1180 350 890 1280 400 990 1374 ಄Ր f 极间距 B H 280 750 300 790 350 890 400 990 52