MER 4800V R-RATED FUSE 4R

  R-RATED MOTOR STARTErFUSES

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 4.8kV (A480R) is available with hookeye tab. 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.

 Features/Benefits

1.     Ferrule mounting for standard clips and interchangeability with other brands of fuses

2.     7.2kV series has the same dimensions as 4.8kV fuses, allowing compact, higher voltage rated designs

3.     7.2kV bolt-in design is available for improved design flexiblity

4.     Optional hookeye on 4.8kV for non load-break isolation by hookstick

  Applications:

1.    Short circuit protection of medium voltage motors and motor controllers

HIGHLIGHTS:

1.    R-Rated

2.    All voltage ratings UL Recognized

  Definitions:

R-Rating:

An R rated fuse will melt in the range of 15 to 35 seconds at a value of current equal to 100 times the R rating.

Back-up type Current-Limiting Fuse:

1.    A current limiting fuse which can interrupt any current between it's rated minimum interrupting current and it's maximum interrupting current. Backup fuses are not designed or intended to open under overload conditions.

• A480R.pdf