Need new part for microwave

[Welchs101]

Hi, my microwave quit working today after my daughter made something and i think i found the problem. i am enclosing a few pics of what i "THINK" is a thermal fuse.......it has "KSD1" .....and "160/" on the front of it....but i am not sure what this means or where to buy it.

when i measure across this device it measures an "open" so i and i think it should be a short......

thoughts on where i can get a replacement device?
thoughts on if this is thermal fuse and should measure a short?