Littelfuse JTD 020 ID 20A, 600V, Class J Time Delay Fuse 20 Amp Fuse, Time Delay, Brand or Series: Class J, Indicator, Interrupting Rating: 200000 Amp AC RMS Symmetrical, Terminal Type: Cartridge, Dimensions: 13/16 Diameter x 2 1/4 Length Inch, Voltage Rating: 600 VAC, Material: Stone Sand and Granular Quartz Filler, Features: Time Delay Dual Element, Visual Indicator.