andy everett wrote:

I bought a reverse action pressure switch that I want to add
electrically in series with the existing well water pressure switch. The
new switch closes on pressure rise. With both switches in series and
with the water tank pressurized if a pipe were to break the well pump
would eventually draw air and the pressure would go towards zero and the
reverse acting switch would shut the pump off. I would have to add a
double pole double throw switch so that at zero pressure the reverse
action switch could be bypassed and the system could come up to pressure.

Can anyone find fault with such a system?

Thank you for your time.


You're right about your pump needing protection like that.
And the addition of another press sw and a manual bypass does have
its appeal.

However, the boys at Square D are way ahead on that score.
For a long time they have offered models in their "Pumptrol"
line which incorporate a mechanical low-pressure cutoff feature.

http://ecatalog.squared.com/catalog/.../17320014.html

Look at the FSG2, for example.
Order it with the M4 Form modification which gives
it a built-in low pressure cutoff. (listed half way down page)

FSG with M4 is an on-the-shelf item at most supply houses.
And the price can't be beat.
Not to mention all the labor you save not having to wire in
additional devices...

Jim