PSR Series POWR-SPEED® High-Speed Square Body

By Littelfuse Inc 117

PSR Series POWR-SPEED® High-Speed Square Body

Littelfuse POWR-SPEED® fuses are specifically designed to protect 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. Variable frequency drives, inverters, UPS, rectifiers, and soft-starters are examples of typical equipment designed with sensitive power semiconductor devices that cannot withstand any line surge or overcurrent conditions and require high-speed protection.

Littelfuse POWR-SPEED PSR series products offer optimized circuit protection at the extremely fast speed required to protect modern day power conversion devices. Such products are commonly found in numerous applications including pulp and paper industries, cranes and heavy-lifting equipment, processing industries, wastewater treatment plants, and various large factories and MRO facilities.


  • Best-in-class DC performance
  • Extreme current limiting
  • Superior cycling capability
  • Global certification cURus, CCC, and IEC
  • Direct bus-bar mount design
  • Visual and optional microswitch fuse blown indication
  • Low watt-loss design
  • Compliance with US and Canadian requirements
  • Class AR performance according to IEC60269-4