On a residential air conditioning schematic, what is the function of a contactor?
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A
To step down high voltage to low voltage for the control circuit.
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B
To use a low-voltage signal to switch the high-voltage power to the compressor and condenser fan motor.
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C
To protect the system from operating in dangerously low or high refrigerant pressure conditions.
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D
To control the speed of the indoor blower motor based on the thermostat setting.