Why do flat power plugs have two round holes?
Many people do not know the function of the two round holes on the flat plug pins and why the manufacturer designed them like that.
These two round holes will help the plug to be more stable and secure. Inside the standard power outlet, there is usually a raised part that fits snugly into this round hole, helping the plug to make more secure contact with the two metal bars inside the socket.
The plug’s fixing helps ensure stable contact with the power source. This round hole also prevents children from colliding with the power outlet and being in danger. Many round-pin plugs do not fit snugly into the outlet but are partially exposed, posing a danger to young children. Therefore, you should use flat-pin plugs with holes on the top if you have small children.
Many practical uses
Previously, people designed dents on the socket pins. However, this method can easily cause friction when plugging the plug into the socket and cause an electric spark. Using punched holes will help reduce friction when newly plugged in, avoid short circuits, and make it safer for users.
Manufacturers also take advantage of the 2 holes at the base of the plug to attach a seal, helping consumers distinguish between new and used products.
In addition, although these two round holes are small, they still help manufacturers save a significant amount of steel, especially in large-scale production lines.
