Littelfuse SPFJ Series Solar Fuses are part of the POWR-GARD portfolio and are the smallest 1000VDC 125-450A photovoltaic fuses available on the market. The SPFJ series is manufactured in Class J case sizes that allows for both fuseholder and busbar mounting configuration thereby reducing the panel size. The SPFJ Series meet both UL and IEC photovoltaic standards and offers full-range PV time-current characteristics. requirements. The Littelfuse SPFJ Series Solar Fuses are ideal for inverters and re-combiner boxes. Littelfuse LFJ 1000VDC Solar Series Fuseblocks are also available.