What role does a timing relay play in a part-winding starter system?

In a part-winding starter system, the timing relay manages the connection of coils in the motor. This is essential because a part-winding starter operates by engaging two sets of windings in the motor sequentially, which helps to reduce starting current and allows the motor to gradually reach its full operational speed.

The timing relay ensures that the first set of windings is energized for a specific period to allow the motor to start slowly once the power is applied. After this set period, the timing relay activates, connecting the second set of windings to the power supply, thus allowing the motor to transition smoothly to full speed. This sequential engagement helps to promote efficient motor performance and can also protect the motor from excessive starting currents.

The other options do not accurately reflect the purpose of a timing relay in this context. The control of motor speed, determination of voltage supply, and prevention of overheating are governed by different components and principles associated with motor control systems. By focusing on the management of coil connections, the timing relay plays a critical role in ensuring the smooth operation of the part-winding starter system.