Overload means that what the motor is dragging exceeds the weight that the motor can drive. Then there is an overload!
Motors have a fixed operating power, called rated power, in watts (W). If the actual power used by the motor exceeds the rated power of the motor under certain circumstances, this phenomenon is called motor overload.
There is a thermal relay (overload protection) in the main circuit of the motor. When the motor is overloaded, the thermal relay acts, the normally closed contact cuts off the control circuit, and the normally open contact closes and turns on the indicator light.
After the overload is removed, the thermal relay contacts have two reset methods to restart the circuit: manual reset-need to press the reset button; automatic reset-overload removal, wait a while, it will automatically return to normal after cooling.