PD330:开关磁铁座尺寸60*50*55mm,机械臂总长275mm;PD380开关磁铁座尺寸75*50*55mm,机械臂总长325mm;PD430开关磁铁座尺寸75*50*55mm,机械臂总长375mm;装表孔径6.5/8.1mm