Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 70 aR 1200VDC (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.



  • Extremely fast acting
  • Excellent cycling capability
  • Very low I²t
  • Worldwide acceptability
  • Current Limiting
  • Superior Cycling Ability


  • Volts (VDC) 1200 VDC
  • Ampere Range (A) 20 - 215 A
  • Speed / Characteristic aR
  • Body Style SRF
  • Standards IEC 60269-1 and IEC 60269-4 Compliance
    DC UL recognized component
    UL file E76491
    - 20A-215A, @1200VDC, L/R 10ms, 100KA
    - 20A-215A, @1500VDC, L/R 1-3ms, 100KA
  • Application Protection of inverters
    Protection of motor drives
    Protection of UPS systems
    Railway power and auxiliary circuits
    ESS Battery Rack protection up to 1500 VDC
  • ROHS Compliant Yes
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • D70SF120V100QF - Z079441
  • D70SF120V125QF - A079442
  • D70SF120V160QF - B079443
  • D70SF120V200QF - C079444
  • D70SF120V20QF - C076638
  • D70SF120V215QF - D079445
  • D70SF120V25QF - S079435
  • D70SF120V32QF - T079436
  • D70SF120V40QF - V079437
  • D70SF120V50QF - W079438
  • D70SF120V63QF - X079439
  • D70SF120V80QF - Y079440


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