STC Series Three-Phase AC Synchronous Generator STC Series Three-Phase AC Synchronous Generator 2KW-50KW ZONESUN POWER DRICE YOUR WORLD. ... used in town,countryside,worksites,mountain and pasture districts as electric power source for lighting purpose,they can also be ... system,easy operation and maintenance.The generators are ther-phase,four-wire type,adopted star connection with neutral point, ...