heat. The overload relay monitors the electrical current flowing through the compressor. It is designed to sense and respond to abnormal current levels that could indicate a problem, such as excessive load or motor malfunction. The start relay helps the compressor start by providing an extra boost of power during the initial startup process. It helps overcome the high initial resistance the compressor motor faces when it starts running. If the overload relay detects an abnormal current or excessive heat, it will activate a protective mechanism. This mechanism can include interrupting the power supply to the compressor, shutting it down to prevent further damage or overheating.