littelfuse.com

Rev: 063014

2 of 10

Description

R-rated fuses provide required short-circuit protection for

medium voltage motors, motor controllers and associated

circuitry.These components have limited ability to absorb the

energy of large short-circuit currents. Medium voltage motor

controllers contain overload relays which provide both overload

protection and locked rotor protection to the motor.The

controllers are also intended to interrupt low value short-circuits

within the capability of the motor controller.This protects the

medium voltage fuse from sustained overcurrents which are

less than their minimum interrupting rating.

NEMA Standards for R-rated medium voltage power fuses

require they operate within 15-35 seconds when subjected

to an rms current 100 times the R rating. For example, a

fuse with a 2R rating will open within 15 to 35 seconds on

an applied current of 2 x 100 = 200 amperes.

Ordering Number

3"DIA

Dim.A

Clip

Center

6.38"

Dim.B

9.75"

A

D

DD

DDD

Figure 1

Figure 2

Figure 3

Hookeye Feature*

For hookeye attachment; add “W” suffix

to part number

*See web for Bolt Mount, Inverted Bolt Mount, and Bolt-In dimensions

Max Voltage (KV)

Style:

C (Cartridge)

B (Bolt Mount)

IB (Inverted Bolt Mount)

BI (Bolt-In Mount)

No. of Barrels

Rating (size)

Continuous Current

Characteristics

Voltage Ratings

2,750 V – 8,250 V

Current Range

2R – 36R

Options

• Hermetically sealed for use in hazardous locations

(add “S” suffix to part number)

• Bolt-in mounting configurations

Bolt Mount “B”

Sample Part #: 130-4R-1B-5.5

Inverted-Bolt “IB”

Sample Part #: 130-4R-1IB-5.5

Bolt-In Mount “BI”

Sample Part #: 130-4R-1BI-5.5

Cartridge “C”

Dimensions

Medium Voltage

Fuse Protection

voltage fuses provide

short-circuit protection

for motors and

transformers rated

2,400 to 38,000 volts AC.

Visit littelfuse.com/MediumVoltage to

download the white paper featuring protection

tables, sizing recommendations, and applications.

130-4R-1C-5.5

R-RATED MEDIUM VOLTAGE FUSES