A low-pressure cut-off switch is a safety device used in various applications to protect equipment from damage caused by low pressure. They are commonly found in:

• Water pumps: In well water systems, a low-pressure cut-off switch prevents the pump from running dry, which can overheat and damage the pump. When the water pressure falls below a set point, the switch turns off the pump.
  

  Lowpressure cutoff switch for water pumps
• Refrigeration systems: In refrigerators and air conditioners, a low-pressure cut-off switch protects the compressor from damage if the refrigerant level falls too low. This can happen due to a leak or a malfunction.
  

  Lowpressure cutoff switch for refrigeration systems
• Air compressors: In air compressors, a low-pressure cut-off switch prevents the compressor from overheating if the air pressure falls below a set point. This can happen if there is a leak in the system or if the compressor is not properly lubricated.
  

  Lowpressure cutoff switch for air compressors
• Oil burners: In oil burners, a low-pressure cut-off switch prevents the burner from operating if the oil pressure falls below a set point. This can happen if there is a leak in the oil line or if the oil filter is clogged.

Low-pressure cut-off switches are typically adjustable, so the pressure at which they trip can be set to meet the specific needs of the application. They are a vital safety device that can help to prevent costly damage to equipment.