Semiconductor Protection Fuses

Square Body High-Speed Fuse-Links DC Protection

Protistor® size 120 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. To complete these fuse-links Mersen recommende to use the standard microswitch (ref. G310023, MCR3E1-5N).



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


  • Volts (VDC) 2000 VDC
  • Ampere Range (A) 20 - 215 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
    EES Battery Rack protection
  • ROHS Compliant Yes
  • Lead Free Consult Technical Services
  • CE conformity Yes


  • D120SC20C100QF - R079457
  • D120SC20C125QF - S079458
  • D120SC20C160QF - T079459
  • D120SC20C200QF - V079460
  • D120SC20C20QF - J079450
  • D120SC20C215QF - W079461
  • D120SC20C25QF - K079451
  • D120SC20C32QF - L079452
  • D120SC20C40QF - M079453
  • D120SC20C50QF - N079454
  • D120SC20C63QF - P079455
  • D120SC20C80QF - Q079456


Find what you need fast...

Quick Links

Where to buy


© 2019 Mersen S.A. All rights reserved.