I got the wrong pressure switch and was thinking what it could be used
for (can't seem to find the shipping papers). I had wanted to make our
oil furnace even safer by adding a control that would shut the furnace
down if it ever lost water pressure. I think such controls are available
but realized that the switch I have would probably also work. The
contacts close on pressure rise.

The specs.

Pressure Switch, Water Pump, Reverse Action, Contacts Close On Pressure
Rise, Diaphragm, Pressure Range 4 To 45 PSI, Differential Pressure 6 To
20 PSI

Included paper states that the max. pressure is 300 psi.


Can you think of a reason why such a switch wired in series with the
power to the furnace could not or should not be used?

Thank you for any help.