COOPER BUSSMANN PVS-R-300 Solar Fuse, 300A, Class RK5, PVSR, 600VAC/DC. More details: Solar Fuse, 300 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, 10kA DC, Length 11-5/8 In., Diameter 2-3/8 In., Standards UL Std. 248-12, Class RK5, UL Listed, Guide JFGA, File E335324, Photovoltaic to UL 2579, CSA Component Certified C22.2