Hubbell Wiring Device Straight Blade Receptacle Current Rating 50 Amps Voltage Rating 125/250 Volts Power Rating 3 HP NEMA Configuration 14-50 Number of Poles 3 Number of Wires 4 Color Black Twist-Lock Plug Hubbell's Wiring Devices division offers a wide array of electrical and electronic wiring devices, wire management systems, occupancy sensors, lighting controls and specialized wiring products for the marine and healthcare markets.