R449 voltage regulator of a sealed electronic devices,by adjusting the excitation current in order to stabilize the output voltage of the brushless generator.
voltage sensing: 5VA insulated transformer with input voltage taps at:
Terminals 0-110V=95-140V
Terminals 0-220V=170-260v
Terminals 0-380V=340-520V
Load current 7A
overload current 15A,10s