Medium Voltage IEEE Fuses

Back-Up R-Rated Bolt-On Fuses for Motor Protection

15.5 kV Bolt-On Mount Motor

Mersen R-Rated fuses are current-limiting, high interrupting rating fuses intended for the short circuit protection of medium voltage motors and motor controllers. R-Rated fuses are back-up fuses that have a minimum interrupting rating, and must be coordinated with overload relays in combination motor starters. The motor starter manufacturer generally specifies the R-Rated fuse size. These fuses are single, double, triple or quadruple barrels 3 inches diameter with end mounts designed for bolting directly to equipment bus or terminal pads



  • The Amp-Trap® Bolt-in series are UL Recognized.
  • Bolt-in mounting for direct connection to bus or terminals.
  • Current-limiting for superior equipment protection.
  • Metal embossed catalog number and manufacturing date for lasting identification.
  • Blown-fuse indicator to give positive identification of open fuse.
  • Amp-Trap®: 3" Barrel 2 lb tripped force - 0.50 Inch


  • Voltage Range (VAC) 15.5 kV VAC
  • Ampere Range (A) 9R to 38X A
  • I.R. AC (kA) 50 kA
  • Speed / Characteristic R-Rated
  • Mounting Bolt-on
  • Connection Terminal Type Bolt-on
  • Body Style Ferrule
  • Body Material GMG
  • Materials Contact Silver-Plated Copper
  • Standards UL Recognized to
  • Application Protection for 15.5kV Motors
  • ROHS Compliant Consult Technical Services
  • Lead Free Consult Technical Services
  • CE conformity Consult Technical Services
  • UL File Card E93367 MSSS2.E93367


  • A155B2D0R0-12R
  • A155B2D0R0-9R
  • A155B3D0R0-18X
  • A155B3D0R0-24X
  • A155B4D0R0-32X
  • A155B4D0R0-38X


  • CAD Drawings

    • Drawing A155B2D0R0(9R-12R) :   PDF (53 KB)
    • Drawing A155B3D0R0(18-24)X :   PDF (56 KB)
    • Drawing A155B4D0R0(32-38)X :   PDF (55 KB)



Where to buy


© 2018 Mersen S.A. All rights reserved.