Went to check my sister in laws water pressure as they had none. I found that the breaker was tripped at the water pump site and there was on 15# of pressure on the gauge. Reset the breaker and the pressure built up to about 60psi then settled down again to 40. It is a square D 30-50 pressure switch. Breaker tripped again and again the pressure built up and stayed at 40psi. Is the pressure switch bad or something else?