Hubbell Wiring Device-Kellems HBL Circuit-Lock, HBL420MI9W, Pin and Sleeve Mechanical Interlock, 3-Phase Female Grounding Non-NEMA Standard UnFusible Watertight Pressure Screw Terminal, 240 V AC, 20 A, 5000 W Power, 3 Pole, 4 Wires, 1 in Hub, NEMA 4X/12K/IP67 Enclosure, Threaded Mounting, Thermoplastic, Blue, 8-3/4 in L x 7-3/4 in W x 11-1/2 in H Dimensions