Square D pressure switch

[Fitter30]

Didn't know they made a switch like this one. Has a built in low pressure safety. Pressure drops 10 lbs lower than on contacts turns pump off. Manual reset
SKU
9013FSG2J21M4

 

[Reach4]

The switch with the lever sounds more useful than it is. For one thing, after a power outage, you would often have to hold the lever to get going again.

If you rely on that feature to detect a well going dry, it may not trip out. If the well is sucked dry before cutoff, the pump can continue to run, sucking air, for a long time. I had a softener that got stuck in backwash overnight. It pumped the well dry, but the well was constantly refilling at a rate less than 2.4 gpm. So a mix of water and air got pumped up for a long time. I wish I had checked the pressure gauge before putting a stop to the problem.

This is not to say that it is not sometimes useful to do what you want. It is definitely cheaper than the more-effective dry-well devices. Those devices detect the current drop as you run dry, and turn the pump off for a programmable amount of time.

In https://terrylove.com/forums/index.php?threads/frugality-at-its-finest.82903/ LLgetfa said

I looked at the Square D I had with low cut-off and figured out that I could lobotomize it. I removed the little metal piece that trips it and so now it is a standard pressure switch.

 

[Sponsor]

 

[LLigetfa]

I agree with Reach4. It only sounds useful and can be a downright nuisance and/or can give a false sense of security meanwhile the pump can still melt down.

 

[Valveman]

Didn't know they made a switch like this one. Has a built in low pressure safety. Pressure drops 10 lbs lower than on contacts turns pump off. Manual reset
SKU
9013FSG2J21M4

Yeah low pressure cut off switches are a very common nuisance. Many people use them. As was said, they are not as reliable for protecting the pump as a dry run relay like the Cycle Sensor. Model number ends with an M4 means low pressure cut off.