Industry-Leading Protection in Solar String Apps

Product Announcement from Littelfuse, Inc.


The Littelfuse SPFI solar fuse series has been engineered to integrate into an in-line assembly within a wire harness. The fuse provides photovoltaic (PV) protection that meets UL 2579 for PV applications. The SPFI is available in multiple ampere ratings to add flexibility to new designs and can be electrically insulated by either overmolding or using heat-shrink. The SPFI series adds a new string protection solution to the Littelfuse portfolio.


  • 1000 Vdc - 2 - 20 Amp
  • UL 2579 Recognized
  • 20,000 A interrupting rating
  • Compatible with overmolding or heat-shrink
  • Wide range of ampere ratings for design flexibility


Solar Line Card