Yes there is most of the time. A new fuse can be obtained from radio shack. Most ovens use a small ceramic cartridge fuse ABC 15 or ABC 20. Please note though that this fuse usually blows because one of the small microswitches in the door circuit is bad (overheated and is burning up inside) or has operated out of sequence with the other several switches. Newer microwaves have one big switch assembly that needs to be replaced when the fuse blows. Make sure the door fully closes when replacing a switch. Be very careful with microwaves. There is very high voltage inside that could severely shock you!
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