The Aerovox 6005mf 29354820MN or Z64S4820M04A1 is a 20uf 480vac 90'C oil filled capacitor. A capacitor's uF rating indicates its capacitance, or its ability to store an electric charge. A microfarad (uF) is one-millionth of a farad, the unit of capacitance. A typical run capacitor rating ...