What happens to the contacts of a motor starter coil when it is de-energized?

When a motor starter coil is de-energized, the magnetic field that was previously holding the contacts closed collapses. The opening of the contacts is primarily facilitated by gravity and spring tension, which cause them to return to their default position, effectively separating the contacts. This is crucial in ensuring that power to the motor is cut off when necessary, thereby preventing potential damage or hazards associated with a continuously powered motor.

In this context, other answers do not align with the operation of a motor starter. For instance, the option stating that gravity and spring tension close contacts would be incorrect because the de-energizing action leads to the opening, not closing, of contacts. The option suggesting electrical signals activate contacts is not applicable since electrical signals are involved when the coil is energized, not de-energized. Lastly, claiming that no noticeable change occurs contradicts the fundamental purpose of a motor starter, which is to actively manage and control the operation of the motor by opening or closing the contacts based on the energization state of the coil.