Why does this three phase induction motor have two kW ratings?
Here are 2 charts, for 50 Hz and 60 Hz, derived from the name plate for clarity.


The nominal kW rating at 50 Hz is not visible on the name plate (appears to be covered by the rivet).
The following comparison is the result of new data for the power rating at 50 Hz (11 kW).

The higher power input would be required at 60 Hz to obtain around the same torque at the higher speed.