The SFS differential pressure switch closes or diverts an electric contact when the differential pressure between the two inlets reaches the upper set-point (intervention) and opens or releases the contact when it drops below the lower set-point (release). It can be used in plumbing systems when it is necessary to make sure the pressure difference between two points does not exceed or drop below a specific value. A pair of permanent magnets, placed in a mutual-repulsion position one inside the pressure switch body and one outside, replace the classic O-ring and shaft
solution and greatly increase the reliability and working life of the pressure switch.