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, at 2.4, 4.8, and 7.2kV. 4.8 and 7.2kV fuses are UL Recognized.  The 7.2kV
(A072F) series has the same dimensions as the 4.8kV (A480R), allowing smaller 7.2kV equipment
or 4.8kV upgrades, and is available as a bolt in version.recognized.