What does the mechanical doorstops contact signal after the operate?

The correct choice indicates that the mechanical doorstops contact signal is related to the limit switches. Limit switches are devices that detect the position of moving parts in machinery, including the doors of an elevator system. When the elevator doors operate, the mechanical doorstops engage, sending a signal through the limit switches to confirm their position. This ensures that the doors are fully closed or fully open, allowing for proper operation of the elevator system and enhancing safety by preventing the doors from moving past their intended positions.

The limit switches play a critical role in the overall functioning of both the door mechanism and the control system of the elevator, ensuring that signals indicating the door positions are correctly communicated to the control panel for safe operation. This is crucial because any malfunction or failure in this signaling could lead to unsafe conditions, such as the possibility of doors opening while the elevator is still in motion.

In contrast, the other options—locking mechanism, power supply, and motor brushes—do not directly correlate with the role of mechanical doorstops in conveying contact signals after operation. While they are important components of the elevator system, they serve different functions and do not specifically relate to the signaling initiated by the mechanical doorstops when the doors operate.