ST vs STC?

[cgwymp]

I'm starting to investigate generators and I'm reading a lot about ST/STC genheads.  However, I'm not clear on what the difference is between ST and STC.  Can anyone enlighten me?

Cheers!

[mobile_bob]

in the ST head, the stator is wound generally for 120/240 single phase power,

in the STC head, the stator is wound generally for 230/400 three phase, certainly
there are likely other variants in voltage, but the stc designates a 3 phase head

bob g

[cgwymp]

Thanks!