THW series generators are made as per standard JB/T8981-1999. And in conformity to IEC34-1. Protection Class:IP21 Insulation Class B or F. The rotor structure is concealed type. Performance is more reliable. THW series generators have five advantages comparing with STC series generators: Compound excitation, Simple circuit, High reliablity, Easy maintenance. Excellent dynamic characteristics, when load or unload suddenly, the circuit's light will not trip/ Approaching sine voltage wave and regulated power supply, output voltage can be safely used on computers. The deviation of the 3-phase line voltage will be less than 3% when the generators undertake unbalanced loading. Power: From 8KW to 400KW ?/DIV>