This secure black/white locking connector from Hubbell Wiring Device-Kellems will keep your equipment from disconnecting. This locking connector has a Non-NEMA configuration with a voltage of 120/208VAC and an amperage of 20. It has 4 poles and 4 wires. It is made of nylon material. It has 3 phases. This has a grade of industrial/commercial. Standards include: UL/CSA.