Marinco 3021C Female 120-208V/30A Twist-Lock 5-Wire Inline Connector30A 3 Phase 120 208V Standard NEMA Locking Connector Specifications Item Connector, locking Rating 30 amperes, 120 208 volts 3 phase Configuration NEMA L21 30R Materials Housing and connector body are nylon with CTI greater than 600 volts Terminals Clamp type, with color coded brass terminal screws, 10 32. Contacts Line contacts are one piece, . 040" thick brass. Cord Clamp Internal, with removable insert to accommodate cable from . 700" (12 5 S)