replacement is cheap. unplug the fans with the ac on, or block the condenser. Have gauges connected to monitor the pressure. It should trip before it reaches 400
switch is faulty
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed....
if your blood pressure is 120/80 or 140/90 mmHg its normal, if its 140/90 mmHg or higher you have high blood pressure and if its 180/110 mmHg or higher than that you have really high blood pressure.