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Mobile IoT Authors: Liz McMillan, Deep Bhattacharjee, Sanjay Zalavadia, Flint Brenton, John Basso

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New Littelfuse Surface Mountable 600VDC Fuse Combines Exceptional Overcurrent Protection with a Space-Saving Footprint

Littelfuse, Inc., the global leader in circuit protection, has developed the Nano 485 Series Fuse, a compact, surface mountable 600VDC fuse for overcurrent protection of high voltage DC circuits. The Nano2 485 Series Fuse packs a high voltage and energy protection capability in a very small footprint. It offers circuit designers a compact, cost-competitive alternative to traditionally larger, through-hole-type fuses for creating cost-effective designs in accordance with the industry trend for surface mount designs. Its fast-acting blow characteristics ensure high-speed protection against surge currents and overload conditions. Applications include use in high-end PC servers, telecom power distribution systems, LCD/PDP TV inverter boards DC input protection, uninterruptible power supply (UPS) systems, 3-phase power supplies, 380VDC servers/lighting in data centers.

“The 485 Fuse Series complements and further broadens the Littelfuse line of surface mount fuses used for the secondary side of circuit protection,” said Daniel Wang, director of global product management for the 485 Series Fuse. “It deepens our offering of quality overcurrent protection solutions for industrial and data center applications.”

The 485 Series Fuse offers circuit designers a variety of key features and benefits:


  • High voltage/interrupting rating in small SMT footprint (12.1 x 4.5 x 4.5 mm)
  • High operating temperature range from -55°C to 125°C
  • 100% RoHS compliant and halogen free
  • Available with current ratings from 500mA to 3.15A, certified UL approved


  • Lowers total cost of power supply design with SMT installation
  • Supports high voltage DC power architectures for state-of-the-art, high efficiency data centers
  • High interrupt capability allows protection of high wattage power supply architectures driving next generation efficient data centers
  • High reliability design and high operating temperature range support demanding mission critical power systems

The 485 Series Fuse is available in quantities of 1,500 in standard tape and reel packaging. Samples are available now for bulk orders; sample requests can be placed through authorized Littelfuse distributors worldwide. For a listing of Littelfuse distributors, please visit

For More Information
If you have questions or require technical support, please contact the Littelfuse technical support hotline at 1-800-999-9445. For circuit protection application design ideas, please visit the Application Design Center section of the Littelfuse website.

Technical Contact
Daniel Wang
Director of Global Product Management, 485 Series Fuse
[email protected]

About Littelfuse
Founded in 1927, Littelfuse, Inc., the worldwide leader in circuit protection, offers the industry’s broadest and deepest portfolio of circuit protection products and solutions. Littelfuse devices protect products in virtually every market that uses electrical energy, from consumer electronics to automobiles to industrial equipment. In addition to its Chicago, Illinois, world headquarters, Littelfuse has more than 30 sales, distribution, manufacturing and engineering facilities in the Americas, Europe and Asia. Technologies offered by Littelfuse include Fuses; Gas Discharge Tubes (GDTs); Positive Temperature Coefficient Devices (PTCs); PulseGuard® ESD Suppressors; SIDACtor® Devices; Silicon Protection Arrays (SPA® Devices); Switching Thyristors; TVS Diodes and Varistors. The company also offers a comprehensive line of highly reliable Electromechanical and Electronic Switch and Control Devices for commercial and specialty vehicles and Sensors for automobile safety systems, as well as Protection Relays and underground Power Distribution Centers for the safe control and distribution of electricity.

For more information, please visit the Littelfuse website:

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