Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 2x122 aR 2000VDC

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


  • Volts (VDC) 2000 VDC
  • Ampere Range (A) 500 - 800 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 Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Consult Technical Services


  • D2122SD20C500QF - E076640
  • D2122SD20C630QF - F076641
  • D2122SD20C800QF - V096066


Find what you need fast...

Quick Links

Where to buy


© 2019 Mersen S.A. All rights reserved.