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SPFJ Solar Fuse
Unique Offering
The SPFJ is the first fuse in the electrical industry UL 2579 Listed and designed to protect photovoltaic (PV) applications at 1000 VDC and 70-450 A.
Littelfuse is the solar circuit protection market leader and and has expertise with over 14 million devices installed in PV systems. The SPFJ offers a unique solution to inverter- and re-combiner box manufacturers across the world, helping to further protect solar power systems and increase safety. It also offers a full-range PV time-current characteristic for added protection. 
Agency Approvals
The SPFJ is UL 2579 Listed, designed and manufactured in accordance with IEC Standard 60269-6 and VDE certified for 125-450 A.
These rigorous standards ensure the safety of both equipment and personnel and make the SPFJ a truly global product.
Small Footprint and Multiple Mounting Options
The 125-450 amperages are offered in Class J case sizes, allowing significant space savings opportunities for OEMs, which can help significantly reduce costs.
Customers can either mount the SPFJ to a busbar or any three specifically designed 1000 VDC holder options to match their unique applications.
Catalog # Certificates Amps (A) VDC (V) Interrupting Rating Opening
SPFJ070 ul 70 1000 20000 Fast-Acting (F)
SPFJ080 ul 80 1000 20000 Fast-Acting (F)
SPFJ090 ul 90 1000 20000 Fast-Acting (F)
SPFJ100 ul 100 1000 20000 Fast-Acting (F)
SPFJ125 ulVDE_40023242icon 125 1000 20000 Fast-Acting (F)
SPFJ125L ul 125 1000 20000 Fast-Acting (F)
SPFJ160 ulVDE_40023242icon 160 1000 20000 Fast-Acting (F)
SPFJ160L ul 160 1000 20000 Fast-Acting (F)
SPFJ200 ulVDE_40023242icon 200 1000 20000 Fast-Acting (F)
SPFJ200L ul 200 1000 20000 Fast-Acting (F)
SPFJ250 ulVDE_40023242icon 250 1000 10000 Fast-Acting (F)
SPFJ300 ulVDE_40023242icon 300 1000 10000 Fast-Acting (F)
SPFJ350 ulVDE_40023242icon 350 1000 10000 Fast-Acting (F)
SPFJ400 ulVDE_40023242icon 400 1000 10000 Fast-Acting (F)
SPFJ450 ulVDE_40023242icon 450 1000 20000 Fast-Acting (F)




Our staff possesses decades of in-depth application knowledge and we are eager to share it with you. All of our field engineers have control gear and fuse backgrounds, making us uniquely qualified to provide solutions to your protection problems. We offer selection software to accurately apply our products, fuse audits to help you streamline your operations, or in-house seminars to educate your personnel. Ask us! 


From the friendly voice that answers the phone, to the delivery that arrives before you expect it, we pride ourselves on delivering the absolute highest level of customer service. At Fusetek, customer service is not an empty promise but the way we do business, each and every day. Use us! 


Can’t find that unusual fuse? Not sure about a particular application? We can help. 

Our quick, knowledgeable replies get you the answers you need, when you need them.   Whether it’s technical assistance, help in finding that special fuse, or quick turnaround to get you out of a jam, we’re here for you. Call us!

Contact Us

Toll free for North America
Tel: 1-800-479-3875
Fax: 1-800-866-7690
International Tel: 1-613-384-4144 International Fax: 1-613-384-0167

Email: info@fusetek.comMailing Address: 599 Norris Crt.
Kingston, Ontario
Canada K7P 2R9