... by Cummins engine. Low fuel consumption. EPA, CE, ISO certificate . Brushless,H class Insulation, IP23 Diesel Generator set power by Cummins engineFrequency50HZ60HZVoltage400V440VSpeed1500RPM1800RPMOutput range20KW ... insulation, Self excitation, IP 23 protection, AVR regulator,THF < 5%,low radio interference.3) 3 phase 4 wires / 1 phase 2 ...