First you should run a new 20 amp circuit for the micro only. If that breaker trips the problem is with the micro unit, get appliance repair. Also a note on the previous post. Overloading a wire will NOT cause the breaker to trip. If you have wire rated at 15 amps and it is fed from a 30 amp breaker it will work fine. If you start to draw high amperage it will still work fine. The wire will heat up and burn down the house. The breaker will only trip when IT is overloaded.
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