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Surface Mount Fuse features 600 Vdc rating.

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December 11, 2012 - Measuring 12.1 x 4.5 x 4.5 mm, Nano2® 485 Series protects high-voltage DC circuits from surge currents and overload conditions. RoHS-compliant device is available with current ratings from 500 mA to 3.15 A and provides interrupting current rating of 100 A at 600 V. Housed in ceramic for operation in ambient temperatures from -55 to 125°C, fuse is suited for high-end PC servers, telecom power distribution systems, LCD/PDP TV inverter boards, UPS systems, and 3-phase power supplies.

Surface Mountable Nano2® 485 Series 600VDC Fuse Combines Exceptional Overcurrent Protection with a Space-Saving Footprint

(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)

Littelfuse, Inc.
800 E. Northwest Hwy.
Des Plaines, IL, 60016

Press release date: November 14, 2012

Ceramic Housing Makes It Suitable for Working Environments from -55ºC to 125ºC

CHICAGO, —Littelfuse, Inc., the global leader in circuit protection, has developed the Nano2® 485 Series Fuse, a compact (12.1mm x 4.5mm x 4.5mm), surface mountable 600VDC fuse for overcurrent protection of high voltage DC circuits. The 485 Series Fuse is designed for overcurrent protection of high energy DC circuits and applications. It packs a high voltage and energy protection capability in a very small footprint, which offers important advantages to today’s circuit designers. The 485 Fuse Series provides fast-acting blow characteristics to ensure high-speed protection against surge currents and overload conditions. Its ceramic housing ensures robust operation and long-term reliability, even in environments with high ambient temperatures (-55ºC to 125ºC).

The 485 Series Fuse offers circuit designers a compact, cost-competitive alternative to traditionally larger, through-hole-type 600VDC fuses for creating cost-effective designs in accordance with the industry trend for surface mount designs. It is available with current ratings from 500mA to 3.15A, all certified under the UL Components Recognition Program. This RoHS compliant part is halogen free in accordance with worldwide environment, health, and safety standards.

Applications for the 485 Series Fuse 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 Series Fuse offers circuit designers a variety of key benefits:
• Surface mount packaging allows designers to adapt to the trend of surface mounting components on PCBs
• Packs a high interrupting current rating at 100A@600V in a small footprint (12.1mm x 4.5mm x 4.5mm), making it ideal for applications with limited board space
• Wide operating temperature range (-55°C to 125°C) and ceramic housing ensure robust performance and reliable overcurrent protection in working environments with ultra-high ambient temperatures
• 100% RoHS compliant and halogen free design ensures compliance with internationally accepted environmental standards
• Suitable for leaded or lead-free reflow soldering, offering greater flexibility in solder type selection
• UL/CSA Agency approvals ensure compliance with international safety standards

Daniel Wang, director of global product management for the Littelfuse 485 Series Fuse, notes, “The Nano2 485 Series complements and further broadens the Littelfuse line of surface mount fuses used for the secondary side of circuit protection. It deepens our offering of quality overcurrent protection solutions for industrial and data center applications.”
The 485 Series Fuse is available in quantities of 1,500 in standard tape and reel packaging.

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); Protection Relays; PulseGuard® ESD Suppressors; SIDACtor® Devices; TVS Diode Arrays (SPA™); 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, as well as Protection Relays and underground Power Distribution Centers for safe control and distribution of electricity in mining operations.

For more information, please visit our website at
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