Littelfuse Inc. has released the SPFJ high-amperage fuse for 1,000 VDC photovoltaic circuit protection. According to the company, its new SPFJ Series is the first 1,000 VDC, high-current fuse to be approved to the new UL photovoltaic fuse standard, UL2579. The SPFJ is also designed to meet the new IEC photovoltaic fuse standard, 60269-6, with independent certification expected later this month.
Additionally, the SPFJ Series is approved as a UL Class J fuse. This approval qualifies the fuse for branch and feeder circuit applications, and the form factor of the Class J fuse accommodates either low-cost busbar mounting or easy replacement through the use of the newly released UL 4248-18 listed 1,000 VDC fuseblock, Littelfuse says.
The fuse's small footprint reduces panel size and allows more flexibility for designers of solar inverters, array combiners, and other high-direct-current applications, the company adds.