Littelfuse 700-xxx Series - Manual (Page 2)

© JUNE 2011 Littelfuse POWR-GARD Products www.littelfuse.com
POWR-GARD ® Fuses—Medium Voltage
2
R-RATED MEDIUM VOLTAGE FUSES
Current-Limiting
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.
Part Number System
130-4R-1C-5.5
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-W 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
POWR-GARD ® medium
voltage fuses provide
short-circuit protection
for motors and
transformers rated
2,400 to 38,000 volts AC.
Visit www.littelfuse.com/technicalcenter
for additional protection tables, sizing
recommendations, and applications.