What is the main function of a motor starter coil when energized?

The primary function of a motor starter coil when energized is to activate the motor. When the coil receives power, it creates a magnetic field that engages the starter mechanism, typically closing contacts that allow electrical current to flow to the motor itself. This process initiates the motor's operation, enabling it to start and perform its intended function.

The other choices do not accurately describe the role of the motor starter coil. For instance, cooling the motor is not a function of the starter coil; that role is typically managed by the motor's design or external cooling systems. An energized starter coil does not open solenoid valves, as solenoid valves have different operational mechanisms to control fluid flow. Monitoring voltage is also outside the scope of the motor starter coil’s function, which primarily focuses on connecting and disconnecting power to the motor rather than monitoring electrical conditions. Understanding this helps clarify the specific and critical role of the motor starter coil in motor operations.