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The Square-D Pressure Switch Type-G is designed for reliable performance in various well applications to provide dependable pressure control and long-term value. When pressure drops to the cut-in point, the switch starts the pump, and when pressure rises to the cut-out point, it shuts the pump off. This heavy-duty switch operates within a pressure range of 50 to 70 PSI, making it ideal for maintaining steady household water pressure by cycling well pumps on and off. Its robust mechanical design supports reliable performance and a long service life.
Durable construction for long-lasting use
Adjustable operating range from 50 to 70 PSI, suitable for home and industrial use
Compatible with a wide range of pumps and tanks
Easy installation and maintenance, with installation-ready design and routine inspection of diaphragm wear and terminal corrosion for long-term performance
The Square-D Telemecanique Type-G pressure switch is a heavy-duty Square D pressure switch with an adjustable 50 to 70 PSI range, built to control electrically driven water pumps by starting the pump at the cut-in pressure and stopping it at the cut-out pressure for consistent pressure management. For homeowners, contractors, and commercial users running well water systems, residential or commercial pumping systems, or industrial equipment, it is a common choice when reliable, adjustable pressure control matters.
The switch uses a diaphragm for pressure response, while the spring mechanism sets the cut-in and cut-out thresholds. It features a DPST contact arrangement, adjustable differential, a 0.25 inch NPSF pressure connection, and a general purpose indoor NEMA 1 enclosure, with a pressure adjustment mechanism that lets users calibrate cut-in and cut-out pressures to system requirements.
A well water pressure switch helps to control a well pump system which helps provide water to a household or business. The pressure switch has a spring on the inside that’s connected to electrical contacts. As time goes on, the spring becomes weak and the electrical contacts wear out which can make it seem that your pump isn’t working quite right.
What does 20/40, 30/50, 40/60, 50/70, and 60/80 mean?
These numbers represent the pressures that your pressure switch is tuned to in the water line. The first number is what tells the pressure switch to send a signal down to your pump to turn on. The second number tells the pressure switch to send a signal down to your pump to turn off. You may hear the terms “cut-in pressure” and “cut-off pressure” = cut-in pressure / cut-off pressure.
What does a Low Cut-Off Pressure Switch do?
A low cut off pressure switch turns the pump off in the event that the water pressure in your lines drops lower than the cut-in pressure (low number). Imagine that there was a leak or break in your water line. This would cause the pressure in your line to drop and your pump to kick on and stay on which could lead to flooding of your home or business. The low cut off pressure switch would turn the pump off if the pressure drops 10 psi below the cut-in pressure (low number). Think of it as a nice piece of protection
What does a Heavy Duty Pressure Switch do?
It does the same thing as a regular non-heavy duty pressure switch except the build of it is a little more heavy duty and recommended to use with pumps that are 2.0 hp to 5.0 hp. Pumps that are 1.5 hp and below you can just use the regular non-heavy duty pressure switch.
How to Troubleshoot a Pressure Switch?
Turn off the electricity to your pump and turn off the circuit breaker.
Remove the cover of the pressure switch.
If water is leaking from the switch, you’ll need a new switch.
If water is leaking under the switch’s nipple connection, tighten the nipple clockwise a little.
Check out the contact points and if the discs are black, pry it apart and feel the discs. If you feel small holes then the contacts are bad. Replace your switch.
Next turn the electricity back on. Be careful not to touch any part of the switch during this next test.
Look at the two sets of electrical contacts inside the pressure switch. If the contacts are open and there’s no water pressure, cycle the switch by pulling the contacts open. This might help loosen up the spring. If you see the switch close, kick the power back on. If the contacts stay open and there’s no pressure, then the switch is bad.
Turn on a water faucet and let your pump do a full cycle. If you see the switch open and close it might have just been stuck because of some built up debris. If the switch doesn’t close when the pressure drops then the spring is bad and you’ll need to replace the entire switch. If you see electrical sparks, turn off the power right away and replace your switch.
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