COOPER BUSSMANN PVS-R-20 Solar Fuse, 20A, Class RK5, PVSR, 600VAC/DC. More details: Solar Fuse, 20 Fuse Amps, Nonindicating, PVS-R Series, 600VAC/DC Voltage Rating, Fast Acting, Single Element, RK5 Class, Fiberglass Body Material, Rejection, Body Style Cylindrical, Interrupt Rating 200kA AC, 20kA DC, Length 5 In., Diameter 13/16 In., Standards UL Std. 248-12, Class RK5, UL Listed, Guide JFGA, File E335324, Photovoltaic to UL 2579, CSA Component Certified C22.2