Which contact is commonly referred to as the overload contact?

The term "overload contact" specifically refers to a component in contactor circuits that operates when the current flowing through the circuit exceeds a predetermined level. This mechanism is crucial for the protection of electrical motors and equipment, as it prevents overheating and potential damage by interrupting the circuit when an overload condition is detected.

By sensing excessive current, the overload contact ensures that the connected equipment is cut off or protected in circumstances where it may draw too much power, helping to maintain a safe operation and prolong the life of the equipment. The use of overload contacts is standardized in many electrical systems to enhance safety and reliability. In contrast, the other options like interlock, staging, and holding contacts serve different functions and are not primarily associated with protecting against overload conditions.