What causes the low-pressure cutout switch to actuate?

The low-pressure cutout switch is designed to protect the refrigeration system by monitoring refrigerant pressure. When the pressure drops below a certain threshold, which signifies a potential issue such as low refrigerant levels or a malfunction in the system, the low-pressure cutout switch actuates to turn off the compressor. This prevents further operation of the system under unfavorable conditions that could lead to damage, specifically related to the avoidance of compressor burnout or cavitation.

In a refrigeration cycle, low refrigerant pressure can be indicative of several problems, including leaks or insufficient charge, and can lead to the compressor running without adequate lubrication or cooling, ultimately resulting in system failure. By actuating at low pressures, the cutout switch serves as a critical safety feature, ensuring that the system operates only under safe and effective conditions.