If you are looking to improve system reliability and lower maintenance costs for your power applications, Littelfuse has the solutions. Littelfuse offers both overcurrent and overvoltage solutions with their PSR Series High-Speed Square Body Fuses and their AK/LTKAK high energy TVS Diodes.

Littelfuse PSR Series High-Speed Square Body Fuses are specially 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. Littelfuse AK/ LTKAK Series high energy TVS Diodes offer superior clamping performance over standard Silicon Avalanche Diode (SAD)Technologies. LTKAK series also offer the highest power rating (8x20μs waveform) among surface mount TVS available in the current market. Both overcurrent and overvoltage protections are ideal solutions for Power Applications.

Potential Applications

DC Systems (DC Common Bus, DC Injection Braking)

Power Grid and Distribution Systems

Battery Protection Application (Energy Storage Systems)

Electric Vehicle Charging Stations

Heaters and Power Supplies


  • Best in class DC performance
  • High-interrupting capacity
  • Excellent current-limiting
  • High short-circuit current rating
  • Global certification cURus, CCC, IEC
  • Up to 200 kA Interrupting Rating
  • Class aR performance according to IEC60269-4


  • Precise clamping voltage
  • No wear-out mechanism
  • Truly surface mountable package option for LTKAK series
  • Lower leakage & Faster response
  • Improved lead inductance for LTKAK series
  • Improved heat sink capability for LTKAK series