A breaker is required for safety.

Your appliance/microwave may cause a fire. The breaker is preventing a fire.

Your microwave may have a short, are you able to; hire an electrician or replace the appliance.

Sometimes, electrical problems cause fires, breakers may prevent fires.

in the old days, a magnetron could blind someone.

It’s either a bad microwave (most likely) or a really sensitive ground fault breaker. I would unplug the microwave from the outlet and plug into a different circuit (may require a heavy duty extension cord). If the microwave trips the new circuit it’s the microwaves fault, if it’s fine you have an overly sensitive breaker.

@ Hallett & Co. That is a great idea... the extension cord. I do have H/D ones I can try that with.

@Jim Mat. yes very aware, thus the reason for my question. Thanks for confirming I wasn't over cautious.

So for roughly the last 2 and a half weeks I have had the Microwave on an extension cord running to another circuit. I've not tripped a breaker since doing that. I realize that since I'm on a different circuit the original breaker wouldn't trip, but neither has the breaker for the temporary connection.

Having said that, the microwave has blanked itself twice. Once immediately after establishing the new connection ,and just now. I have seen the LED display flicker while opening the door, but infrequently. Originally the breaker was tripping and the microwave was blanking (requiring resetting) daily.

I'm thinking that, as mentioned, there is an issue with the oven. The cowboy wiring here probably doesn't help matters any.