What is the job of the holding contact in a motor starter?

The role of the holding contact in a motor starter is to maintain the electrical circuit for the coil once the motor has started. When the motor starter is energized, the coil pulls in, closing the main contacts to supply power to the motor. In this state, the holding contact closes, which keeps the coil energized even after the start button is released. This action allows the motor to continue running without requiring constant pressure on the start button.

By keeping the coil in the circuit, the holding contact plays a critical role in ensuring that the motor remains operational until it is intentionally stopped. This function is essential for the automated control of motors, as it provides a stable and reliable means of maintaining motor operation without manual intervention.