How does an electronic overload relay indicate a fault condition?

An electronic overload relay indicates a fault condition primarily by lighting up a warning LED. This visual indicator serves as an immediate and easily recognizable alert to operators that there is an overload or fault situation occurring within the motor circuit. The use of a warning LED allows for quick identification of the problem, facilitating rapid intervention.

The functionality of electronic overload relays includes sophisticated monitoring of the motor's operating conditions, such as current levels. When the relay detects conditions that exceed preset thresholds, it energizes the LED to display an alert. This visual cue is beneficial in industrial settings where personnel can be alerted to issues without needing to monitor every aspect constantly.

In addition to this, while audible alarms or signals sent to a PLC may also form part of a comprehensive motor protection strategy, these methods are not the specific indication mechanism of an electronic overload relay. The primary indication method is through the warning LED.