CaJazzMan
one of the things you can do as an ez check, with the power off,,, in your spa remove the pumps from the board, also the ozone plugin, the lights, you can alos remove the electrical to the heater, try to reset the breaker if it holds then either your pump, ozone , heater, lights one of those could be bad,,, i would first check your ozonater see if the check valve failed and you hav water going into the ozone unit that can cause it....if you turn on the breaker and trips it is possibly the breaker in you disconnect.. hopefully this gives you a starting point....