Which of the following is a component of a magnetic motor starter?

A magnetic motor starter is an essential device in electric motor control systems that facilitates the starting and stopping of electric motors while providing protection and control features. Among its components, an overload relay is crucial as it protects the motor from overheating due to excessive current, which can lead to damage.

Control relays are also a part of the magnetic motor starter, serving to manage the control circuit for starting and stopping the motor. Contactors are another significant component; they are electrically controlled switches that allow power to flow to the motor during operation.

All of these components work together within a magnetic motor starter to provide comprehensive functionality: the overload relay offers protection, the control relay manages the control logic, and the contactors handle the actual electrical current to the motor. Thus, the answer that encompasses all these components is correct, as it acknowledges the collaborative role they play in ensuring the effective and safe operation of electric motors within various applications.