YR series motor from 4kw-500kw, 2,4, 6, 8p, IP44,54 class F insulation ... netting that is not enough to start the squirrelcage rotor motor, long and frequent start and in connecting the electric shaftto ... insulation is of Grade F and the operation of this motor is S1(continous running). Connection mode: (3KW.Y);Rotor Y ... or in the form of a complete set. YR series motor