Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 121 gR 750VDC (IEC)

Mersen DC offers provide a very high performant protection for railway power and auxiliary circuits. Mersen DC Semiconductor fuse-links were developed to provide improved performance required by today's new DC equipment. These fuse-links are typically operated at more elevated temperature than other fuse type, have lower I²t to minimize damage to protected components on short circuits, lower watts loss and longer life.



  • Multiple body sizes and terminals or blades combination
  • Very low I²t
  • Extremely fast acting
  • Eliminate all overloads
  • Excellent cycling capability


  • Ampere Range (A) 200 - 250 A
  • Speed / Characteristic gR
  • Standards IEC 60269-4 Compliance
  • Application Protection of inverters
    Protection of motor drives
    Protection of UPS systems
    Railway power and auxiliary circuits
    Similar 750VDC or less equipments
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Consult Technical Services


  • D121GC75V200EF - A086710
  • D121GC75V200TF - N085250
  • D121GC75V250EF - M085203
  • D121GC75V250TF - Q085252


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