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Refer to figure.
In the diagram, the component 3 is a:
  • A
    battery.
  • B
    contactor
  • C
    static inverter.
  • D
    TRU.

Refer to figure.
Component 3 is placed between AC BUS 2 and DC BUS 2, therefore it can only be a device that converts AC to DC. This device is called a Transformer Rectifier Unit.

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