New compact SMD fuse enables enhanced protection for high-voltage applications

Littelfuse, Inc. has launched the Nano2 415 SMD Series Fuse, the company's first surface-mount fuse with a 1500A interrupting rating at 277V. Developed to provide true buffering for 250V applications with unpredictable voltage fluctuations, the series offers excellent fault current protection in a compact SMD package, making it ideal for space-constrained applications.

"This new fuse – our first with a high 1500A interrupt rating at 277V – provides electronic designers using legacy through-hole solutions with an option to switch to an SMD part," said Daniel Wang, senior director of Product Management, Over Current–Passives, at Littelfuse. "By doing so, they can fully automate their assembly process, increasing production efficiency and reducing manufacturing costs."

Key Features and Benefits:

• Industry-leading interrupting rating: With a 1500A interrupting rating at 277V, the series ensures protection against high fault currents in critical applications.
• Optimised for fluctuating voltage environments: The 277V rated voltage delivers true buffering in 250V applications, safeguarding against unpredictable surges.
• Enhanced surge withstand capability: Higher I²t values than competitive solutions provide improved surge and pulse withstand capacity.
• Compact, surface-mount design: The SMD form factor allows engineers to replace through-hole fuses, streamlining automated assembly processes and lowering production costs.

The Nano2 415 SMD Series is excellent for a range of applications, including:

• Consumer electronics – Power adapters, chargers, and power supplies
• Industrial systems – Inverters, converters, and instrumentation
• Automotive – EV charging stations, home chargers, and lighting
• Appliances/White Goods – Washers, dryers, and refrigerators
• Home automation – Automated garage doors and smart home systems

The 415 Series provides a drop-in replacement option for other fuses on the market while delivering higher I²t values for superior surge withstand capability. Additionally, it serves as the SMD alternative to the company's 215 Cartridge Series, delivering a higher voltage rating (277V vs 250V) while replacing the existing through-hole cartridge fuse solutions. By transitioning to an SMD fuse, electronics engineers can fully automate their manufacturing processes, leading to faster production, higher throughput, and reduced labour costs – ultimately making their end products more competitive.