Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 72 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 watt 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) 160 - 420 A
  • Speed / Characteristic aR
  • Standards IEC 60269-1 and IEC 60269-4 Compliance
    DC UL recognized component
    UL file E76491
    - 160A-420A, @1200VDC, L/R 10ms, 100KA
    - 160A-420A, @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 1500VDC
  • ROHS Compliant Yes
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • D72SG120V160QF - K079428
  • D72SG120V200QF - L079429
  • D72SG120V250QF - M079430
  • D72SG120V315QF - N079431
  • D72SG120V350QF - Q085574
  • D72SG120V400QF - P079432
  • D72SG120V420QF - Q079433


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