Is there a fix for this problem mine does the same thing, i changed the powerstrip and it worked fine for a month, now it's doing it again runs for too minues or so then it trips the circuit breaker in the power strip
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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.
Generally microwaves should be on their own breaker. Hard wired ones are required to be by code.
If yours has a plug - make sure the plug is original with the unit, not added later or spliced onto hard-wired power leads.
Plug into and outlet rated 15A as the only thing on a 15A branch circuit and try again. If it still trips, try a 20A line and circuit. If it trips that, trash the microwave and buy a new one. Nothing is meant to be repaired inside.
Circuit Breakers do weaken over usage. It is not usually a time factor as much as a load factor. Each time a circuit breaker trips, it loses its ability to carry the same load as it did previously. In other words, a 15 amp breaker only carries the ability to carry 15 amps once. I recommend replacing the circuit breaker with one that has a matching rating. If you do feel up sizing is necessary, check the load rating of the appliances to make sure the additional size really is necessary. Increasing power to appliances that shouldn't need it increases the risks of potential electrical fires and masking real issues. Try changing it with higher amp breakers.
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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.
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?
Check what other appliances are on your circuit. What goes off when the breaker is tripped. You may need to relocate the microwave to a different circuit. Try to stay away from the refrigerator or AC circuits.