{HEAD ~ AND gates} of {TAIL ~ the power levels} for controlling said realized level combinations by controlling positions of signal contacts of the three phase contactors by means of said contactor position lines 
{ HEAD ~ AND gates } of { TAIL ~ the power levels } for controlling said realized level combinations by controlling positions of signal contacts of the three phase contactors by means of said contactor position lines
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH