Compatible with electrical safety standards applicable in the United States and Europe, the AK Series family power entry boxes are primarily made of PA-66 nylon and handle 25A to 50A, three-phase, 600V. Said to be "green" in construction, the contents are entirely recyclable for non-renewable contents after the host appliance is exhausted. Metal contacts in the series can be copper, brass, tin-plated brass or nickel-plated steel. Power distribution terminals are fitted with recessed, touch-safe screw heads and floating vise-clamp screw terminals accommodate wire sizes from 18 to 8 AWG.