Pressure switch experiencing premature failure

New pump and pressure switch three years ago, pressure switch was failing in July, no making good contact, replaced with a new one, lasted two weeks and experienced same failure, replaced again and after 1 week am experiencing the same failure ...contacts not mating properly, gonna put one more on tomorrow...any ideas why these would be failing so quickly? You can see that the mechanism has moved to the on position, but no solid contact is made. a little push with a stick and it kicks right in an does the job it was designed for

 

How much current are you switching?

Is sand blowing into the pressure switch?

 

What brand pressure switch are you buying?

 

Using Chinese switches? Use Square D and make sure they are not clicking on and off every 5 seconds. And you can buy replacement contacts for them and leave the body in place.

 

Have not measure current, 1.5 hp pump, no sand blowing in. Have watched it activate and it appears contacts are bouncing and arcing.

 

Can you show us a photo that includes the pressure switch and the input to the pressure tank?

 

Tank and well and pump are all in good shape. Used two Square D's then one Chinese and now back to Square D. Am going to modify spring assembly for more contact pressure when it closes. First presure swithc lasted 9 yeaers, then had new pump installe and Tech installed new pressure switch, it tran good for about two years, then contacts went bad, replaced with identical switch which lasted 3 weeks. REpalced again (Chinese) nd it worke great for aobut 5 days, then contacts acted up again. Cycling ok today. Bought new Square D an will install later, also have tww more coming with replacement contacts. Will play with modifying one with stronger pressure springs to eliminate contact bounce and arc