Hi Subystud,
Regarding the nameplate, this one shows the ratings for a "Worldwide" standard 6 leads IEC motor that can be connected in Delta @ 380/400 V, 50 Hz or 440/460 V-60 Hz and can be connected also in Wye @ 660/690 V, 50 Hz. Just note name plate is not indicating the ratings for Y connection at 60 Hz that should be 760-800 V. The manufacturer is not providing that data because 760-800 v is not a standard voltage for 60 Hz. (US and Canada use 230-460-575 V).
Manufacturer is providing ratings a three different voltages because is taking account the possible voltage variations in the 50-60 Hz three-phase power systems granting his motor efficiency IE2 according to the standard.
In this case if the motor are going to be installed in the US @ 460 V-60 Hz you have to connect the motor in Delta. Because the rated connection is Delta you can start the motor with a Wye-Delta starter for decrease the starting current if the application allows it and avoiding power supply issues (in case the three-phase power supply can´t start the motor DOL). For setting the breaker,contactors and protection devices use the current provided for 460 V-60 Hz: 10.5 Amp.
Best Regards
Petronila