Which component in a motor starter holds the coil in the circuit during operation?

Which component in a motor starter holds the coil in the circuit during operation?

• A. Overload relay
• B. Holding contact
• C. Auxiliary contact
• D. Power contactor

Answer: (B)

The component that holds the coil in the circuit during operation is the holding contact. When a motor starter is engaged, the holding contact closes as a result of the initial activation by the power contactor. This creates a path for current to continue flowing through the coil of the motor starter even after the momentary start button is released. The importance of the holding contact lies in its ability to maintain the coil's energized state during operation, allowing the motor to run continuously until the circuit is interrupted (e.g., by pressing the stop button). This functionality is essential in ensuring that the motor remains operational without requiring constant manual intervention. In terms of function, the holding contact serves a different role compared to the other components listed. Overload relays are designed to protect the circuit by disconnecting power in case of excessive current, while auxiliary contacts serve to provide additional switching capabilities, often for signaling or interlocking purposes. The power contactor primarily functions to close or open the main circuit, allowing or stopping power flow to the motor.

The component that holds the coil in the circuit during operation is the holding contact. When a motor starter is engaged, the holding contact closes as a result of the initial activation by the power contactor. This creates a path for current to continue flowing through the coil of the motor starter even after the momentary start button is released.

The importance of the holding contact lies in its ability to maintain the coil's energized state during operation, allowing the motor to run continuously until the circuit is interrupted (e.g., by pressing the stop button). This functionality is essential in ensuring that the motor remains operational without requiring constant manual intervention.

In terms of function, the holding contact serves a different role compared to the other components listed. Overload relays are designed to protect the circuit by disconnecting power in case of excessive current, while auxiliary contacts serve to provide additional switching capabilities, often for signaling or interlocking purposes. The power contactor primarily functions to close or open the main circuit, allowing or stopping power flow to the motor.