1. Flat pins have large surface area for good electrical contact and easy manufacuring of sockets
  2. Fuse makes them tend to not be sealed and so they are reusable
  3. Earth pin connection wire is longer than others so it gets disconnected last when pulled
  4. Other pins have insulator so earth pin is always connected
  5. A fuse
  6. Big enough to fit 5V DC transformers inside
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