What are some features of IEC overloads?

The features of IEC overloads include single phase sensitivity and the ability to mechanically adjust the trip settings. Single phase sensitivity allows the overload relay to detect imbalances in phases; this is critical in applications where motor protection is needed for three-phase systems. The mechanical trip adjustment provides flexibility in setting the threshold at which the overload relay will activate, making it adaptable for different motor specifications and operational conditions. This adjustability is important to ensure reliable protection while accommodating variations in the running load.

In contrast, other options focus on aspects that are not core features of IEC overloads. For example, phase detection alone lacks the comprehensive capabilities that include sensitivity and trip adjustments. Automatic resets may be beneficial in certain applications but do not encapsulate the full range of functions provided by IEC overloads. Dual voltage operation is not a standard characteristic as IEC overloads are designed to specifically address motor protection without necessarily operating across multiple voltage configurations. Lastly, high voltage operation is not typical for IEC overloads, which are more focused on providing robust protection at standard operational voltages.