What device is used to confirm that a dryer motor is operating?

The centrifugal switch is specifically designed to confirm that a dryer motor is operating properly. As the motor starts and reaches its operating speed, the centrifugal switch engages, allowing power to be redirected to other components such as the heating element in a dryer. This mechanism is crucial because it ensures that the motor is not only turned on but is also functioning at the correct speed before enabling additional features that rely on the motor's operation.

In contrast, the other devices mentioned serve different functions: a motor safety switch is typically used to disconnect power from the motor in case of a fault, a motor sensor switch may monitor various conditions like speed or temperature without confirming operational status, and a high limit switch is mainly a safety device designed to prevent overheating by shutting off the heating element when a certain temperature is exceeded. Thus, the centrifugal switch uniquely confirms that the dryer motor is fully operational and ready to perform its intended tasks.