Hi, my tappan microwave tmv151s over the counter , I put a bad bag in it and it caught fire, did I blow the fuse? I cant seen to find a fuse foe it, does it have a fuse or other things that went bad? Thak you richard

If you put a bag with a metallic foil in it you likely damaged or burned out the magnatron and potentially damaged other parts.

You checked the HOUSE fuse/circuit breaker? You plugged another appliance in the same outlet to see if it works? You plugged the microwave into a known working outlet? Those are the first 3 steps.

Placing anything in the microwave that is not microwavable can cause damage to the magnatron and even catch fire.

I personally wouldn't go plugging it back in if there was a fire inside it , and take it down to a specialist to have it checked out.

Also here's a video on how a Microwave / Magnatron works, understand this will make you understand why the Magnatron could be damaged.

( https://www.youtube.com/watch?v=kp33ZprO0Ck )

Anyway I would say having something that reflect the wave back at the Magnatron would damage it like I will state below.

" Metals, on the other hand, are great conductors of electricity, being packed with electrons that can move freely. Depending on the shape/type/thickness/distribution/etc. of metal, you may observe some heating of the metal itself in the microwave or none at all. You may also observe some arcing of electricity or none at all. In any event, when these microwaves hit the metal, free electrons on the surface of the metal end up moving from side to side very rapidly. This, in turn, prevents the electric wave from entering the metal; thus, the waves end up being reflected instead. However, there is also the potential that this ends up creating a sufficient charge density that the electrical potential in the metal object exceeds the dielectric breakdown of air. When this happens, it will result in arcing inside your microwave, from that metal to another electrical conductor with lower potential (often the wall of the microwave). In extreme cases, these electrical sparks can end up damaging the wall by burning small holes in the metal wall. It can also end up burning out the magnetron in your microwave oven or, in modern microwaves, can provide a surge that ends up damaging sensitive microelectronics, possibly killing your microwave or making it unsafe to use, in the case of a hole in the inner metal wall in your microwave. "

Also @ Smoothy

Often people put metals in the microwave anytime they put a hot pocket in the little pouch and place it in the microwave. The pouch has a thin layer of aluminum lining the inside that is designed to absorb the microwaves and heat up a bit so as to brown the outside of the hot pocket.

Though yes I do agree with you also Smoothy .

Placing something with metal inside a microwave that isn't designed to go into a microwave is asking for trouble.

Hope this helps