Six lead IEC (metric) motors are sometimes dual voltage rated. Here, the high voltage would be the wye, and the low voltage would be the delta.
JValdes :.. yes this is very common with IEC motors espcally that true in european area they used the 6 lead pretty much of the time but i heard they are starting to switch over to 12 leads as well and some do have 3 leads only as well
Merci, Marc