... 3.good performance 4.competive price STC SERIES THREE-PHASE A.C.SYNCHRONOUS GENERATORINTRODUCTIONST series generators are used in town, countryside ... , IP23,Insulation Class:B or F, adopting harmonic excitation system, safe and reliable using, easy operation and maintenance.The ... not exceed 1000m.Cooling air temperature: 258~313K(-15°C~40°C).Relative air humidity :not exceed 90%. AC Synchromous ...