Semiconductor Fuses


  • Littelfuse PSX Series

    PSX

  • Littelfuse PSX series 1500 V dc high-speed square body fuses are specially designed to protect batte...More

  • Amps (A): 80, 100, 125, 160, 200, 250, 280, 315, 350, 400, 450, 500, 550, 630, 700, 800, 900, 1000, 1100, 1250 more

  • Interrupting Rating: 200kA@1500VDC

  • Opening: Very Fast-Acting (FF)

  • Littelfuse PSR High-Speed Fuse Series

    PSR Flush End

  • Littelfuse PSR Series High-Speed Square Body Fuses are specially designed for protection of power se...More

  • Amps (A): 40, 50, 050, 63, 063, 80, 080, 100, 125, 160, 200, 250, 280, 315, 350, 400, 450, 500, 550, 630 more

  • Interrupting Rating: 100kA@1300VAC, 200kA@600VAC, 200kA@650VAC, 200kA@700VAC

  • Opening: Very Fast-Acting (FF)

  • PSR Bolted Blade

    PSR Bolted Blade

  • Littelfuse PSR Series High-Speed Square Body Fuses are specially designed for protection of power se...More

  • Amps (A): 40, 50, 63, 80, 100, 125, 160, 200, 250, 280, 315, 350, 400, 450, 500, 550, 630, 700, 800, 900 more

  • Interrupting Rating: 100kA@1300VAC, 200kA@600VAC, 200kA@650VAC, 200kA@700VAC

  • Opening: Very Fast-Acting (FF)

  • Littelfuse PSR DIN Blade

    PSR DIN Blade

  • Littelfuse PSR Series High-Speed Square Body Fuses are specially designed for protection of power se...More

  • Amps (A): 40, 50, 63, 80, 100, 125, 160, 200, 250, 280, 315, 350, 400, 450, 500, 550, 630, 700, 800, 900 more

  • Interrupting Rating: 100kA@1300VAC, 200kA@600VAC, 200kA@650VAC, 200kA@700VAC

  • Opening: Very Fast-Acting (FF)

  • L50QS

  • The L50QS Series is a next generation High-Speed Fuse for the protection of power semiconductor devi...More

  • Amps (A): 35, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 275, 300, 325, 350, 400, 450 more

  • VAC (V): 500

  • VDC (V): 500

  • L70QS

  • The L70QS Series is a next generation High-Speed Fuse for the protection of power semiconductor devi...More

  • Amps (A): 35, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600 more

  • VAC (V): 700

  • VDC (V): 700

  • Littelfuse L75QS

    L75QS

  • The L75QS Series is a next generation High-Speed Fuse for the protection of power semiconductor devi...More

  • Amps (A): 35, 40, 50, 60, 70, 80, 90, 100, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600 more

  • VDC (V): 750

  • Interrupting Rating: 50kA@750VDC

A power semiconductor device is a high power electronic device that is used as a switch for control and conversion in electric power. The use of power semiconductor devices in modern power electronics is driven by the need for better power efficiency, with the ultimate goal of achieving as close to 100% power efficiency as possible. In addition to power efficiency, there is a need to make the device as small as possible, which is a driving factor as to why power semiconductors have replaced older electro-mechanical components.

Typical equipment using power semiconductor devices includes inverters, rectifiers, electric vehicle battery management systems, locomotive traction drives, industrial motor drives, factory automation systems, air conditioners, computers, telecom devices, battery chargers, and many more. To protect these very sensitive power semiconductor devices from an overcurrent fault, an extremely fast acting and low energy let-through circuit protection device is needed. The only device available in the world to protect these sensitive devices are semiconductor fuses. .

Understanding the protection requirements and selecting the right semiconductor fuse for your application can be an overwhelming, time-consuming process even for a seasoned power electronics design engineer. An important part of developing quality overcurrent protection is understanding system needs and overcurrent protective device fundamentals.

  • Overload Fault Condition: Defined as an overcurrent that is confined to the normal current path, which if allowed to persist in the circuit, will cause damage to equipment and/or any connected wiring. Overcurrent protective devices must disconnect circuits and equipment experiencing continuous overloads before any overheating occurs.
  • Short-Circuit Fault Condition: An overcurrent that flows outside its normal current path in the circuit is a short-circuit fault condition. A short-circuit fault is most commonly caused by an insulation breakdown or a faulty connection. When a short-circuit fault occurs, the current bypasses the normal load and takes a shorter path, hence the term short-circuit.

Performance capabilities of semiconductor fuses are determined in the form of various characteristic curves where two or more electrical performances are compared and represented graphically. Typical semiconductor fuse characteristic curves include:

  • Time Current Curve
  • Watt Loss Performance Curve
  • Temperature Derating Curve
  • Peak Let-through Current Curve
  • Arc Voltage Curve
  • I2t Curve

pdf icon POWR-Speed Technical Application Guide

Your complete guide to high-speed (semiconductor) fuses. Download the application guide to find out more.

pdf icon POWR-SPEED® Range of High-Speed Fuses - Flyer

Optimized protection for your power electronics.

pdf icon POWR-SPEED® Fuse Cross Reference

This guide covers the most popular high-speed fuse types that Littelfuse has in stock and ready to ship.

pdf icon POWR-SPEED® Catalog

These certified high-speed fuses are optimized for performance and efficiency to better protect your critical power semiconductors against short circuits. PF611

pdf icon POWR-SPEED® Range of High-Speed Fuses Flyer - Mandarin

为您的电力电子设备提供最佳保护

pdf icon POWR-SPEED® Catalog - Mandarin

高速半导体熔断器产品目录

pdf icon POWR-SPEED® Fuse Cross Reference - Mandarin

本指南涵盖Littelfuse最受欢迎的 高速熔断器类型,库存充足,可随 时发货!交叉引用旨在对快速识别 和产品选型作出指导。我们建议 您在进行替换之前查看全部适用 规格。