What is the purpose of a contactor in an HVAC electrical circuit?
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A
To measure and display voltage and current to the compressor
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B
To act as an electrically operated switch that uses a low-voltage control coil to open and close high-voltage power contacts to the compressor or fan motor
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C
To protect against ground faults in the power supply
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D
To convert single-phase power to three-phase power for the compressor