The power supplied to almost all 3-phase AC motor applications is controlled through a system of electromechanical control relays, power contactors, and/or motor starters, which split the control of the 3-phase AC motors into two separate circuits:
Electrical power applied to the solenoid coil of the electromechanical control relays, power contactors, and/or motor starters is controlled by an array of normally-open or normally-closed contacts mounted on pushbutton or selector switches, pilot devices, such as limit, pressure, or temperature switches, or control relays within the __________ circuit.
In the __________ circuit, three separate sets of normally-open contacts on the power contactor or motor starter are closed simultaneously by the energization of a solenoid coil; and open simultaneously with the de-energization of the same solenoid coil.
A) power or load; signal or control
B) signal or control; power or load
C) any of the answers
D) power or load; power or load
Show Answer
Answer:B
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