The starting and stopping of a well water pump is typically controlled by a pressure switch similar to the one shown below.
Low water cut off pressure switch.
Low pressure cut off water pressure switch want close and turn on the pump if i push it close the pump comes on asked by.
The switch is preset with both the cut on and cut off pressure.
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This switch cuts off and the lever trips when 10psi below cut in pressure is detected.
The cut on pressure is the low pressure that starts the pump and the cut off pressure is the high pressure that turns off the pump.
The low pressure shut off switches are available with low pressure cut off point of approximately 8 to 10 lbs.
The lever is for low pressure cutoff reset.
The low water pressure switch attachment drops to turn off the pump when it loses its prime and the pressure drops to a specific low pressure cut off point.
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This is a very good feature if you lose input pressure to the pump because of leaks or loss of water supply.
Larry for this inquiry will need to refer you to 800 435 2121 and discuss with a specialist.
Switch remains closed at 5 psi or more when pressure drops below 5 psi switch will open and cut off the power to the pump.
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Low pressure cutoff switch technical details pressure range 20 to 65 psi.