R-Rated MOTOR STARTER FUSES Amp-trap 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. Amp-trap R-Rated fuses are rated 2R to 36R. 4.8kV fuses are UL Recognized.