Locking Plug, Connection Orientation Straight, Current Rating 30 A, Housing Color Black, White, Housing Material Nylon, NEMA Plug Configuration L21-30P, Number of Blades 5, Number of Poles 4, Phase Three, Polarized Yes, Resistance Properties , Impact , Watertight, Voltage Rating 120/208V AC, Wire Connection Type Screw Terminals, Wiring Style Standard, Face Diameter 2.23 in, For Maximum Cable Diameter 1.15 in, For Minimum Cable Diameter 0.35 in, Grade Industrial