The NEMA 6-20 is a type of electrical receptacle and plug configuration used primarily in North America. It is designed for devices that require a 240-volt power supply and can handle up to 20 amps of current. The unique design features a T-shaped slot, which prevents the insertion of incompatible plugs, ensuring safety and proper connection. This receptacle is commonly used for heavy-duty appliances, such as air conditioners and power tools. The NEMA 6-20 standard helps to ensure that electrical devices operate efficiently and safely, reducing the risk of overloads and electrical hazards in residential and commercial settings.