COOPER BUSSMANN JJN-1000 Fuse, 1000A, Class T, JJN, 300VAC/170VDC. More details: Fuse, 1000 Fuse Amps, Nonindicating, JJN Series, 300VAC/170VDC Voltage Rating, Fast Acting, Class T, Single Element, Body Material Melamine, Nonrejection, Bolt-On Body Style, Interrupt Rating 200kA at 300VAC, 100kA at 170VDC, Length 4 In., Diameter 2 In., Functionally Equal To Ferraz/Gould A3T, Littlefuse JLLN, Standards CE/UL-248-15 Guide JDDZ/CSA Class 1422-02