Jim:
The problem may be your burners. The back one is 550w/110v. The front ones are 1100W/110v. The system is set up so that you can run all three top burners or up to two top burners plus the oven.
The burners simply plug-in and as noted, corrosion can be a problem. Try pulling out the burners and very lightly sanding them and replug. If the breaker still pops, try replacing them. I went on-line and searched for Princess 3342 element burners and a number of sources came up. Paid about $20 for each burner two years ago.
Gene
Gene