Fuses keep blowing out

In case it's still helpful, I'll inject a little sanity into the replies.

If the fuse blows as soon as you hit Start, it's probably a shorted high-voltage capacitor. That's usually economical to repair.

If the fuse blows a few seconds after you hit Start, it's probably a shorting high-voltage transformer. That's usually not economical to repair.

It's not radiation (non-ionizing RF by the way) that's the hazard, it's the voltages.

I have the same experience in replacing five microwave fuses within two days and cost me almost ten dollars. They are expensive. True somewhere inside the circuit had a short. But I could not find any lead in locating the faults, nothing burnt or smell inside the microwave. However I noticed that this blowing fuse acts happened after I cleaning the inside of the microwave oven with grease removal solution. At last I found a thick grease (over ten years history) covered those switches that behind the door notches. So I disconnected all the connection wires from those switches (make sure to draw a trace map of all wire connection before disconnected them, so you can put them back in order), pull out the switches from the cradle and immersed them in the diluted organic grease removal solution for overnight. Gave them a good clean water bath and dry them good before installed them back to the cradles and connected all wires back. I have been using the microwave for more than two months now, no more blown fuse. Please be aware I am not an expert but just share this with you. The greasy switches might be one of the causes. One final warning, please make sure you have the proper skill and knowledge to do this, otherwise find some friend to help you. Hope this help!

Yes a fuse blows because there is an internal short in the unit. The more you replace the fuse and hopes it will fix it, the more damage you may cause and maybe even cause a fire. A fuse blows in a piece of equipment as a safety feature. most fuses do not blow because they simply go bad, they blow because of a problem. First thing would be to check the door switch alighnment. next would be to check the Hi voltage diode and the capacitor, next test should be the magnatron for a short. If you do not have any knowledge on microwaves, call in a pro to assist you in this repair ans there is alot of high voltage inside this puppy. Good Luck

Throw the darn Microwave out before you kill yourself with Radiation. Blown Fuse is a sign of Sorted circuit to ground. With a microwave they are cheap now a days and does not warrant the risk.