Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 122 aR 2000VDC

Mersen DC offers provide a very high performing protection for railway power 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 in extreme environment more than other fuse type, have lower I2t to minimize damage to protected components on short circuits, lower watts loss and longer life time.



  • Extremely fast acting
  • Extremely current limiting
  • Very low I²t
  • Worldwide acceptability
  • Superior cycling ability


  • Volts (VDC) 2000 VDC
  • Ampere Range (A) 160 - 400 A
  • Speed / Characteristic aR
  • Standards IEC 60269-4 compliance
  • Application Protection of inverters
    Protection of motor drives
    Protection of UPS systems
    Protection of similar 2000V or less equipments
    Railway power and auxiliary circuits
  • ROHS Compliant Yes
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • D122SD20C160QF - D076639
  • D122SD20C200QF - X079462
  • D122SD20C250QF - Y079463
  • D122SD20C315QF - Z079464
  • D122SD20C400QF - A079465


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