What does the internal overload of a compressor primarily sense?

The internal overload of a compressor is designed to protect the compressor motor by sensing excessive amperage. When a compressor experiences a situation where it draws more electrical current than what is considered normal, this can indicate a problem, such as mechanical binding, a refrigerant floodback, or an electrical fault. The internal overload responds to this excessive amperage by interrupting the power supply to the motor to prevent overheating and potential damage.

In refrigeration systems, maintaining proper amperage is crucial because it reflects the workload of the compressor. If the compressor is overloaded and continues to draw high amperage, it could lead to failure, damaging the motor or the compressor itself. Thus, the internal overload acts as a critical safety feature, ensuring the longevity and operational health of the compressor.