Hobart 90G20P

When parked on the ground an aircraft cannot use the normal 50Hz (or 60Hz in America) mains power as it needs 400Hz power.
also known as ground power units (GPUs), to allow the aircraft to function whilst on the ground.
Our compact dimensioned frequency converters can be fixed to the gantry
of a passenger loading bridge or can be hung underneath the walkway or simply fixed to a convenient place close to the aircraft.
Our ground power unit is connected to the normal 3 phase mains power source
and delivers an output of 200V 3 phase 400 Hz power to the aircraft through a special flexible cable.