What is the purpose of a low pressure cut off switch in a refrigerant system?

The purpose of a low pressure cut off switch in a refrigerant system is to establish a minimum operating pressure in the evaporator. This switch is crucial for maintaining the efficiency and safety of the system. When the pressure in the evaporator drops below a certain threshold, it indicates that there may be insufficient refrigerant or that the system could be experiencing other issues, such as a restriction or an insufficient flow of refrigerant. If the pressure is too low, it could lead to compressor damage or inefficiencies in cooling. By shutting down the compressor when these low-pressure conditions are detected, the switch helps ensure that the system operates within safe parameters, ultimately prolonging the lifespan of the compressor and optimizing system performance.