A twist lock receptacle (AKA twist lock plug or NEMA plug) locks in the supply of power at the source, ensuring a flow to electricity to machinery and equipment at all times and helping to shorten the list of causes for a potential power loss in commercial, industrial and home applications. Their use requires a plug to be twisted into the receptacle to keep the connection in place. Locking receptacles are available as either female receptacles or male receptacles. Items vary by amps, the number of poles (2 pole receptacle, 3 pole receptacle, or 4 pole receptacle), phase, number of wires, NEMA rating and other considerations. Fore more on receptacles, see our pin sleeve receptacles.