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There must be a fairly major issue with your microwave to trip a 20 amp breaker. I would recommend taking it to your local repair shop or replacing it.
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Check the data. If it should have a 20 amp fuse and it blows or trips a circuit breaker you probably have a faulty element. Try disconnecting each element in turn,
The circuit breakers may both be functioning properly. What might be happening is that both circuits have other current drawing appliances on them. The circuit breakers react to the sum of all of the currents drawn by all of the devices on that circuit. So, if you have a 15 amp microwave and an 8 amp refrigerator on the same circuit, you would overload a 20 amp circuit by 3 amps.
I have a hard time believing that the home's main breaker is tripping instead of the branch circuit breaker that feeds the microwave. I suspect it is really just a difference in terms. You should disconnect it and try using in another outlet - preferably one on a different circuit if possible. If the breaker continues to trip; this appliance should be disconnected and either be discarded, repaired or replaced before using again.
If the microwave works as expected (on a different circuit), it may indicate the original circuit is overloaded. Microwave overs are supposed to be installed on a dedicated circuit. This means only one outlet is on the circuit - no other loads (lights, appliances, etc.) are permitted on this circuit. A microwave typically requires 10 Amps or more when on "high" and will require a significant portion of the power supplied by a 15 or 20 amp circuit breaker. There is little unused to power much of anything else. If other appliances go out when the microwave trips the circuit breaker, you should contact an electrician to have a dedicated outlet installed for the microwave.
The first thing you need to check is the GFI--when it trips, it definitely should shut off power to the circuit. It may be wired incorrectly, or is faulty. There should be a 20 amp breaker and wiring to the oven.It is also much better is the oven is the only appliance on this circuit. Hope this helps!
No. The unit is only supposed to pull 9.1 amps. (wattage divided by voltage equals amps) Your unit has a short, or your breaker is bad. Turn on the unit, when it trips the breaker see if the breaker is hot, If so, thats an indication the breaker is bad.
Microwaves that are either built in, a part of the oven, or over the range are on a dedicated circuit by law. This means nothing else could have tripped that breaker but the microwave.
If it has a problem severe enough to trip a 20 amp breaker several times, it is only getting worse each time you reset the breaker and turn it on.
There is a possible chance of fire. I recommend you turn the circuit breaker off and replace the microwave. Is it a plug in, or over the range type?
needs to have circuit of its own rated @ 20 amps powered by # 12-2-wg wire , also very good idea to plug into a good surge protector to protect its control board, as any computer the boards are very susceptible to spike voltage caused by lightning and power problems , as to how it worked before , breakers vary a little in the amount of current it takes to trip them with age , the number of time they have to be reset and heat they have been subjected to over a period of time so it is not unusual for say one 20 amp breaker to trip @ 16 and another @19 for example also the length of wire between the breaker and the appliance can effect the trip range
Make sure it is plugged into a 20 amp circuit. If it is in a kitchen it should be a 20amp breaker if it trips a 20 amp breaker it needs to be replaced. If it is a new house and you plug it in in the kitchen and it trips a 15 amp breaker then the house does not meet code. ref Article 210.52(B)(1) NEC
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