Which feature is crucial for the functionality of an electronic overload relay?

The functionality of an electronic overload relay relies heavily on its control circuitry. This component is responsible for monitoring the current flowing through the motor and determining if it exceeds preset limits. When overcurrent conditions are detected, the control circuitry processes this information and initiates appropriate protective actions, such as tripping the relay to disconnect the motor from the power supply.

The control circuitry enables the relay to provide precise overload protection, adjust settings for different motor characteristics, and respond quickly to various electrical events, ensuring the safety and longevity of the motor. Other features, such as mechanical contacts, visual indicators, and digital displays, play supportive roles, but they do not carry out the fundamental function of monitoring and controlling overload conditions like control circuitry does.