A connector for high amperage, AC or DC connection includes a plug and a receptacle configured to securely mate and lock with each other. Connector receptacles include a locking mechanism having a sleeve unit having a plurality of openings configured to receive a plurality of alignment members, a control unit in communication with the alignment members, and at least one extension member coupling the sleeve unit to the control unit. The control unit is configured to bias the alignment members to engage a groove in a plug in a locked position. Upon rotation of the control unit, the control unit engages the sleeve unit and allows the alignment members to freely move, thus allowing a user to connect or disconnect the plug from the receptacle.