Microwave causes GFCI on another circuit to trip

something in inverter breaking down when hot and shorting out, cheaper to replace unit than inverter

Is this a new installation?? It sounds like the circuit breaker is under rated for this unit.

The rest in the fuse panel can wear out especially if its been kicked off several times or is quite old so I'd suggest checking it and maybe it's on a line with too many things attached to the circuit causing too much amp draw when microwave is being used.If you know the house amp input to the fuse box and add up the fuses or reset amperage you maybe able to up the amperage by 5amp tops but try a brand new same amperage reset first off.

Starts and runs for 5 seconds and clicks off and Problem with the Panasonic NN-S963BF / NN-S963WF 1350 Watts Microwave Oven

from online Microwave Repair Manual: Totally dead oven (no lights, no clock, no display, no fan, no heat...)First, check power to the outlet using a lamp or radio you know works. The fuse or circuit breaker at your service panel may have blown/tripped due to an overload or fault in the microwave oven or some other appliance. You may just have too many appliances plugged into this circuit - microwave ovens are high current appliances and should be on a dedicated circuit if possible. If you attempt to run a heating appliance like a toaster or fryer at the same time, you *will* blow the fuse or trip the circuit breaker. A refrigerator should never be plugged into the same circuit for this reason as well - you really don't want it to be without power because of your popcorn!

If you find the fuse blown or circuit breaker tripped, unplug everything from the circuit to which the microwave is connected (keep in mind that other outlets may be fed from the same circuit). Replace the fuse or reset the circuit breaker. If the same thing happens again, you have a problem with the outlet or other wiring on the same branch circuit. If plugging in the microwave causes the fuse to blow or circuit breaker to trip immediately, there is a short circuit in the power cord or elsewhere.

The microwave oven may be powered from a GFCI outlet or downstream of one and the GFCI may have tripped. (Removing a broken oven lamp has been known to happen.) The GFCI outlet may not be in an obvious location but first check the countertop outlets. The tripped GFCI could be in the garage or almost anywhere else! Pushing the RESET button may be all that's needed.

Next, try to set the clock. With some ovens the screen will be totally blank following a power outage - there may be nothing wrong with it. Furthermore, some ovens will not allow you perform any cooking related actions until the clock is set to a valid time.

Assuming these are not your problems, a fuse has probably blown although a dead controller is a possibility.

While you can do some repairs on your microwave, what you don't know can kill you... even on an unplugged microwave, so make sure you understand the dangers and how to reduce them before you try anything inside a microwave. If you want to do more yourself, go to the link at the top of this post.

http://www2.panasonic.com/consumer-electronics/support/Home-Appliances/Microwave-Ovens/Genius/Prestige/model.NN-P295SF
In all likelihood the mangnetron has failed, or perhaps even the Power Supply. or a fault that is shutting the system down for safety reasons You need to have it serviced by a reputable service centre/man. Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one.
Service manual below, troubleshoot with that. http://www.eserviceinfo.com/downloadsm/5734/PANASONIC_NN-K652.html

i have microwave problems power trip when switch on the unit. please help me.

are you talking same ground or do you mean shared neutral on a multi-wire branch circuit???If this the case one appliance may draw more current on that phase and the current imbalance is sensed by the g.f.c.i.

It is possible that the extention cord is the problem. Over time wires will heat voltage will drop. Along with the added distance on the code the voltage drop cause a drain and trips the GFCI. Try replacing GFCI and also try opperating without the extension cord.

I’m happy to help further over the phone at https://www.6ya.com/expert/josh_87ce33216d7b2148

Safety first, unplug your microwave from socket outlet.Needs to troubleshoots series of components using eliminating method to know which component(s) that causes breaker to trip off. It is obvious that a componet(s) "shorted out".Remove your fuse and replace it with resetable breaker tested.
Remove leads of the transformer output(secondary side). plug power cord run the microwave.If does not trip off the cct breaker change your transformer. do the same to capacitor lead, one after the other until you discover which component that shorted and cause your cct breaker to trip off.