A dual twenty breaker was off this morning which shut the well down. I replaced the breaker and instead of shutting off slow, the new breaker shut off fast. From the breaker, the heavy 600 V submersible yellow three wire (a 240 line) goes underground for a 100 yards to a well house where the line is hooked up to the water pump pressure switch. After replacing the Schneider D 30/50 switch (confirmed wiring by company tech), the breaker shut off with a flash. So instead of thinking I have a bad pump or relay, I disconnected the line from the pressure switch, capped the three wires and turned on the breaker. It stayed on for a couple of hours and then shut off. The ground is wet and muddy here as snow has started to melt. Does anyone have any idea on how to troubleshoot 100 yards of underground? Maybe I will unhook the wires at the box and see if its the new breaker! Pictures tomorrow and thanks for any help.