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.FEATURES AND BENEFITS:- 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 InchAPPLICATION:- Short circuit protection of medium voltage motors and motor controllers.