It is marked on the side of the case.
Check your bladder tank, make sure it is working. Should be 2 psi below low cut off (20-40 switch should be 18 psi. Pressure switch might need to be replaces if bad. If 20-40 switch should cut off at 40psi. Switches are adjustable.
Check that the precharge in your cold water tank is set correctly to your cut in cut out pressure switch it should be 2 psi below the cut in pressure so 40/60 should be 38 psi in a empty water tank and switch should be as close to tank as possible use digital air pressure tester for best results
According to Squared D specs, yes. For the FSG2 version, cut in can be 10 - 45 psig, with the low pressure cutoff 10 psig below cut in. So if cut in is adjusted to 20 psig, the low pressure cut off would be 10 psig.
NO! Once the pressure drops below 40# the pump will turn on and continue to run until it can pump it back up to 60# or your well runs out of water.
For this inquiry will need to refer you to 800-435-2121 and discuss with a specialist. Regards, Customer Care
If the switch doesn't shut off it will.
Yes. The switch operates on pressure, not voltage.
You do not supply enough detail to answer properly. But in general; shut off power to your pump. Close valve feeding your system (if there is one not on a well, etc). Open a valve somewhere in your system and drain your pressure storage tank if there is one. Hopefully you have a system pressure gauge somewhere to tell you when the pressure is down to zero. Open your system and install. Disinfect after install if required.