ABYC Air Conditioning & Refrigeration Certification Practice Exam 2026 – Your Complete Guide to Exam Success!

The low-pressure cutout switch is typically found on the suction side of a compressor because it monitors the pressure of the refrigerant after it has vaporized and before it enters the compressor. This component plays a critical role in ensuring the safe and efficient operation of the system. If the pressure in the suction line drops below a certain threshold, the low-pressure cutout switch will deactivate the compressor to prevent it from operating in an unsafe condition, which could lead to compressor damage or failure.

By being located on the suction side, the low-pressure cutout switch can accurately measure the refrigerant's pressure as it returns from the evaporator coil, allowing for timely protection measures. Moreover, maintaining appropriate low-pressure levels helps optimize the entire refrigeration cycle, leading to improved efficiency and system longevity.