>I have a Panasonic microwave that keeps throwing a 20A breaker. The
> data plate on the microwave says it should draw 12.7A max, and an amp
> clamp confirms that it's pulling 21A
>
> Fist make sure, that you are not using an extension cord with it.
> Big potential for catching the wiring on fire.
Also, try and make sure, you dont have a fridge plugged in on the
same circuit.
Microwaves, cycle on and off, and when it cycles is when you need a big
surge of juice.
Also, if on same circuit with fridge, the compressor cycling on and
off, will definately affect the fridge.
Are you using an extension or directly plugging in? What
else is using the same circuit? Have you always used it in this location,
or is this something new.?
Would like to help, but need some more info?

Much regards