Standard pressure switch for most well pump systems up to 1 hp.

Double-pole, up to 230V

Has low water protection feature: if the pressure goes 10 psi below the normal pump turn-on  pressure, the switch "assumes" that the well can not provide enough water to protect the pump. The switch will need to be reset manually. This is a very basic method of providiing some run-dry protection for your pump.

1/4" female pipe thread, 1/2" electrical knockouts