Which device is commonly used to provide overload protection for motors?

The line starter is commonly used to provide overload protection for motors because it incorporates a thermal overload relay. This relay monitors the current flowing to the motor and can detect when the motor is drawing too much current, which may indicate that it is overloaded. When the current exceeds a predefined limit for a certain period, the thermal overload relay will trip and disconnect the motor from power, preventing damage to the motor due to overheating.

In addition to protecting the motor, line starters also help to manage the initial power surge when the motor starts, allowing for a smoother operation. This combined functionality makes line starters a critical component in motor control systems, ensuring both safety and efficiency in operation.