Why are polarized plugs designed with blades that are perpendicular to each other?

The design of polarized plugs with blades that are perpendicular to one another primarily serves to prevent misconnection. This means that the plug can only be inserted into a socket in one orientation, ensuring that the live and neutral wires are correctly matched with their respective terminals. This is important for safety and functionality; it reduces the risk of electrical shock and equipment damage that could occur if the electrical polarity were reversed.

While other considerations may play a role in the design of electrical plugs, such as aesthetic choices or manufacturing efficiencies, the fundamental function of polarizing the plug is to guarantee that users cannot inadvertently connect devices in a way that could lead to hazardous situations. Thus, ensuring proper electrical connection is inherently linked to the prevention of misconnection, making this design choice a critical safety feature in electrical devices.