How are overload contacts in a motor starter reset?

• A. By turning off the main power
• B. By replacing the overload relay
• C. By pushing the reset button on the starter
• D. By disconnecting the motor

Answer: (C)

Overload contacts in a motor starter are designed to protect the motor from overheating due to excessive current. When an overload condition occurs, these contacts open, interrupting the power supply to the motor. To reset this condition and allow the motor to start again, the most effective and standard method is to push the reset button on the starter.

This reset button is a part of the overload relay mechanism. When it is pressed, it allows the contacts to close again, restoring the circuit and enabling the motor to operate. This is a safety feature that ensures operators intentionally acknowledge and reset potentially dangerous conditions before re-energizing the motor.

Other options, while they may seem plausible, do not address the immediate reset process for the overload contacts. Turning off the main power or disconnecting the motor simply cuts off electricity but does not reset the overload relay itself. Replacing the overload relay might be necessary if the component is faulty, but it is not a routine measure to reset the overload contacts after an overload event. Pushing the reset button is specifically intended for this purpose, providing a clear and safe method to restore function to the system.