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Locking receptacles have curved slots that accept matching curved blades on compatible locking plugs. The plugs are inserted into the receptacle and locked into place with a twisting motion to prevent the plug from accidentally disconnecting from the receptacle. Also known as twist-lock receptacles, locking receptacles are to prevent accidental power loss to critical equipment such as data centers and to avoid safety hazards caused by sudden unintended shut-down of machinery such as lathes.