Description: 2-stage:Model NGW-S42......NGW-S122 Range of the Ratio:11.2-56 Range of the Rated Power:2.33-563.6kw Range of the Rated Torque:1910~49714N.M. 3-stage:Model NGW-S73......NGW-S123 Range of the Ratio:56-500 Range of the Rated Power:1.5-199.5kw Range of the Rated Torque:7820~68310N.M.