Normally, an across-the-line motor control stops and starts a motor and provides?

An across-the-line motor control is designed to start and stop motors by connecting them directly to the power supply, allowing for the full voltage to be applied immediately. One of the primary functions of this type of control is to provide over-current protection for the motor. This protection is critical as it safeguards the motor from damage that could be caused by high current situations, such as an overload condition or a short circuit.

When a motor experiences a situation where the load exceeds its rated capacity, the current flowing through the motor can increase, potentially leading to overheating and failure. The motor over-current protection mechanism detects these excessive currents and will typically actuate a protective device, such as a circuit breaker or overload relay, to disconnect the motor from the power source and prevent damage. This ensures that the motor has a reliable safeguard in place to operate safely and efficiently under varying load conditions.

In contrast, options emphasizing protection for lighting, motor speed control, or frequency control do not accurately describe the functions provided by typical across-the-line motor control technology.