Hubbell HBL2813 Electrical Connector Assembly. Wiring Device-Kellems Twist-Lock® Insulgrip® Locking Connector Grounding Heavy Duty 120/208Y VAC 30 A 3 hp 4 Pole 5 Wires NEMA L21-30R Commercial/Industrial Grade IP20 Enclosure 0.35 to 1.15 in Diameter Cord -40 to 75 deg C Pressure Screw Terminal Composite Black/White 3.84 in L x 2.22 in W Dimensions. Additional Description: HUBW-HBL2813 LKG CONN 30A 3P 120/208V L21-30R B/W. Catalog Description: Hubbell Wiring Device Kellems Locking Devices TwistLock IndustrialFemale Connector Body 30A 3-Phase Wye 120/208V AC 4-Pole 5-WireGrounding L21-30R Screw Terminal Black and White.