R-Rated motor starter fuses Amp-Trap® R-Rated DIN style fuses are current limiting, high interrupting rating fuses, intended for the short circuit protection of medium voltage motors and motor controllers. This product range offers North American R-Rated performance in the IEC DIN mounting configuration of 442mm. R-Rated fuses are applied as back up fuses that have a minimum interrupting rating, and must be coordinated with overload relays in combination motor starters. Amp-Trap® R-Rated, DIN type fuses are offered in voltage ratings of 3.3KV, 5.3KV and 7.2KV in ratings from 2R to 19R. All fuses within this product group are UL component recognized. 5500 Volts 3 R.