Protect Critical Power Electronics with High-Speed Fuses
Littelfuse high-speed (semiconductor) fuses protect critical power electronics from overcurrents that may cause damage to your equipment. High-speed fuses are reliable, very fast-acting products that can reduce the amount of short circuit current and improve the life of your power semiconductor devices.






Introducing POWR-SPEED® Fuses!

How is POWR-SPEED® better? Backed by over 40 years of experience, Littelfuse engineered the POWR-SPEED® fuses with an innovative bridge design, arc-quenching material and a robust element to provide fast, extreme current limitation exactly where you need it.


Square Body PSR Series

POWR-SPEED® fuses specifically designed for protection of power semiconductor devices such as diodes, triacs, IGBTs, SCRs, MOSFETs and other solid state devices that are typically designed into power conversion and power conditioning equipment. 变频传动装置、逆变器、UPS、整流器和软启动器是配备灵敏功率半导体器件的典型设备实例,这类灵敏的功率半导体器件无法耐受任何线路浪涌或过流,并且需要高速保护。

Littelfuse POWR-SPEED® PSR Series products offer optimized circuit protection at the extremely fast speed required to protect modern day power conversion devices. 此类产品常见于纸浆和造纸行业、吊机和起重设备、加工行业、废水处理厂和各种大型工厂以及MRO设施等众多应用。


  • 同类最佳的直流性能
  • 极端电流限制
  • 卓越的循环能力
  • cURus、CCC、IEC全球认证
  • 直接母线安装设计
  • 直观、可选的微型开关保险丝熔断指示
  • 低功率损耗设计
  • 符合美国和加拿大标准要求
  • Class AR performance according to IEC60269-4

Round Body Series

Our new high-speed QS Series fuses have reduced the energy let-through by up to 70% over previous generation high-speed semiconductor fuses. Our experts have designed high-performance silver fuse elements that combine with a hardened silica filler to provide enhanced system protection.

POWR-SPEED® Fuses provide…

  • Reduced peak let-through current
  • Reduced energy let-through by 70%
  • Less energy wasted during operation
  • Arc-barrier technology
  • Laser-etched resistance values to eliminate labels that erode over time
  • Quick and easy field replacement
  • Better energy efficiency and impact protection levels


Fast-Acting High-Speed Fuses

Littelfuse High-Speed Fuses are designed to protect today's equipment and systems, and are manufactured with Littelfuse-developed technology that sets tomorrow's standards for accuracy, consistent quality, reliability, and predictable performance. These certified high-speed fuses are optimized for performance and efficiency to better protect your critical power semiconductors against short circuits.

  • Low Watt Losses
  • Controlled Transient Overvoltages
  • Extremely Current Limiting
  • UL认证

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Download POWR-SPEED Fuse Overview Guide
POWR-SPEED Technical Application Guide