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 in diameter with end mounts designed for bolting directly to equipment bus or terminal pads|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