My square d water pressure switch 30-50 cut in and out switch needs help.when it drops to 30 cut in pressure it trips the circuit breaker has to be manually starter with lever on the side of the square d switch,it might work properly 3 or 4 times then it trips the circuit breaker please help if you can,seems to work until much water is needed and pump runs for extended time

I would tend to suspect the pump windings instead of the control box. If it were my call I would check the windings, under load, with a AmpProbe. Good luck, Tom