Image is Representational - See Manufacturer Specs | Power Entry Connector - 3P4W Grounding - 3PH - 50 A - Black - White - Nylon (Polyamide) Body - 250 V. The CS8365C is a 3-pole 4-wire 3-phase 50A/250VAC Twist-Lock� Insulgrip� Grounding Plug. This plug is made of nylon cover, thermoplastic polyester interior and polyester cord grip with 21.08 to 31.75mm diameter, brass blades, stainless steel shell and terminal screws.