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. ラインのサージや過電流に耐えらず、高速保護を必要とする高感度パワーセミコンダクタデバイスを使って設計される一般的な機器には、可変周波数ドライブやインバーター、UPS、整流器、ソフトスターターがあります。

Littelfuse POWR-SPEED® PSR Series products offer optimized circuit protection at the extremely fast speed required to protect modern day power conversion devices.そのような製品は、紙パルプ産業や、クレーンを含む重量物機材、プロセス産業、排水処理施設、さまざまな大型工場、MRO 施設などの多くのアプリケーションでしばしば使用されています。

特徴 / メリット

  • クラス最高の DC パフォーマンス
  • 強力な限流
  • 優れた循環能力
  • グローバル認証(cURus、CCC、IEC)
  • バスバーへの直接実装設計
  • オプションの目視用マイクロスイッチヒューズ溶断表示
  • 低ワット損失設計
  • 米国およびカナダの規制要件に準拠
  • 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 認定

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