3 Phase Compressor

Dear friends,

Please share some knowlede about 3 phase compressors. If by mistake changed the phase sequence of a compresor then it,s direction will also be changed. I want to ask that what will happend when compressor changed the direction. And how we could know that it,s direction is right or wrong. Could be a 3 phase compressor internaly thermal protected? If yes then definately it will be protected on all 3 phases? Not 1 or 2 phases?

If any 3 phase compressor is not starting and it,s 3 lead,s are showing open(no continuty). So how can we knw that it,s winding is flashed or it,s internally overload is triped.

Thank,s and regard,s.