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Hi-Tech Current-limiting Fuses

Hi-Tech® is an industry brand of current-limiting fuses with advanced designs to provide superior protection in small, cost-efficient form factors to optimize value, reliability and reduce system lifecycle costs. With fault-clearing capabilities in less than one-half cycle, Hi-Tech current limiting fuses reduce the let-through energy, significantly reducing equipment stress and increasing safety. 

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  • 100% factory tested and sealed for a long and reliable operating life
  • Some of the lowest current let-through values in the industry for increased protection
  • Rugged machined-brass end caps used for greater ferrule strength, resulting in less distortion and a more secure fuse attachment.
  • Damage sensor significantly reduces the risk of fuse failure


  • Hi-Tech Valiant™ full-range current-limiting fuse for fire mitigation - incorporates over 20 years of field-tested Hi-Tech full-range fuse technology combined with a new visual indicating mechanism, damage sensor, and engagement pin for effortless vertical and rotational alignment.
  • Hi-Tech OS Series Back-up Current-Limiting Fuses - Designed to enhance protection on overhead distribution systems.
  • Hi-Tech EXT Series Back-up Current-Limiting Fuses - Designed for installation in wet well fuse holders for oil filled pad-mounted switchgear and transformer applications.
  • Hi-Tech FX Series Full-range Current-Limiting Fuses - Provides both low and high current fault protection in a single, compact fuse body.
  • Hi-Tech EX Series Full-range Current-Limiting Fuses - Provides both overload and fault current protection for distribution equipment in a single fuse body. 
  • Hi-Tech SX Series Full-range Current-Limiting Fuses - Capable of interrupting any continuous current between the minimum current that can cause melting of its elements and its rated maximum interrupting current.

View the Medium Voltage Application Solution Illustration

Hi-Tech Fuse Catalog

Hi-Tech OS Series Back-up Current-Limiting Fuses

Hi-Tech EXT Series Back-up Current-Limiting Fuses

Hi-Tech EXT Current-Limiting Back-up Fuses

Hi-Tech Valiant Current-Limiting Fuse brochure