Microwave breaker was reading no voltage when in the on position so I removed it off the defective breaker onto a breaker that is working and the microwave circuit came on. I Replaced (4) breakers in main panel, after replacing breakers I verified that each circuit is reading proper voltage. Unfortunately microwave has a short in it and needs to be looked at by an appliance technician. I unplugged the microwave and plugged in a charger with a battery and I let it run for 5 min and did not have any issues but once I plugged the microwave in and started it the breaker would trip. No issues with oven when starting it and letting it run.