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The metal contacts inside very old electrical outlets had bumps which interlocked with the holes in the plug. This kept the plug from easily falling out of the outlet. Modern outlets are simply designed to have more friction.




Modern outlets have "bumps" or detents that serve this "locking" purpose.

Manufacturers of certain items may also use these holes as a lockout by attaching a label etc. through one of the holes.

For instance a warning label stating "WARNING! Before plugging in this device, be sure to ". Since the warning label must be removed to plug in the device, it is much more likely to be noticed and read than if it were on page 1 of the instructions.

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12y ago

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