Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 2x72 aR 1200VDC

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 watt loss and longer life.



  • Low I²t for improved semiconductor protection
  • Extremely fast acting
  • Excellent cycling capability


  • Volts (VDC) 1200 VDC
  • Ampere Range (A) 500 - 840 A
  • Speed / Characteristic aR
  • Standards IEC 60269-4 Compliance
  • Application Protection of inverters
    Protection of motor drives
    Protection of UPS systems
    Protection of similar 1200V or less equipments
    Railway power and auxiliary circuits
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Consult Technical Services


  • D272SG120V400QF - S077963
  • D272SG120V500QF - P077983
  • D272SG120V630QF - F079447
  • D272SG120V800QF - G079448
  • D272SG120V840QF - H079449


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