What is a pressure switch?
A pressure switch is an automatic control device that turns a well pump on and off in response to changes in system water pressure, typically set to cut in at a lower pressure and cut out at a higher pressure.
A pressure switch is an electrical device mounted on or near a water pressure tank that monitors system pressure and automatically activates or deactivates the well pump. When water pressure drops below a set minimum level (the cut-in pressure), the switch closes an electrical circuit and turns the pump on. As the pump delivers water and pressure rises to a set maximum level (the cut-out pressure), the switch opens the circuit and stops the pump.
In Bonner County well systems, the pressure switch is essential for maintaining consistent water delivery without requiring manual operation. Typical residential systems cut in around 30-40 PSI and cut out around 50-60 PSI, though these settings vary based on tank size, household demand, and system design. The switch responds to pressure changes through an internal spring mechanism and electrical contacts.
Over time, pressure switches can fail due to electrical wear, corrosion, or mechanical fatigue, resulting in pumps that run continuously, cycle too frequently, or fail to activate at all. A failing switch often signals problems with tank pressure, water leaks, or check valve issues. Proper maintenance and timely replacement are key to stable water pressure and pump longevity. Local pressure tank and system repair providers can test, adjust, and replace switches as needed.