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United States
Tel: 901.252.8000
800.816.7809
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
www.tnb.com
H-91
Hi-Tech
®
EXT Series Back-Up Current-Limiting Fuses
Power & High Voltage —
Elastimold
®
& Hi-Tech
®
Fuse Products
Application
Designed to enhance protection on overhead distribution systems,
the Trans-Guard
®
EXT Current-Limiting Backup Fuse both significantly
reduces energy let-through during a fault and offers very high
interrupting capability to provide state-of-the-art protection against
today’s ever-increasing available fault currents.
Note:
The Trans-Guard
®
EXT Current-Limiting Backup Fuse interrupts high-level currents
and must be applied in series with another device capable of interrupting low- to
mid-level currents. This is most commonly a cutout expulsion fuse. When properly
coordinated, the Trans-Guard
®
EXT Current-Limiting Backup Fuse always allows
sufficient let-through current to cause the cutout fuse to melt and drop open,
making it easy to visually pinpoint where the fault occurred.
Type of Installations
Durable design features machined brass endcaps and filament-wound
epoxy, centerless ground tubular bodies coated with oven-baked
acrylic paint
Broadest range of ratings available — up to 100K at 8.3kV and
15.5kV; up to 80K at 23kV
Current-limiting action improves power quality by reducing voltage
dip time during a fault and reduces flame discharge and noise
associated with the operation of the series-connected cutout fuse
Wide variety of mounting and connection options for greater
flexibility in installation
100% leak tested to ensure hermetic sealing
Reduced energy let-through provides arc flash reduction
SOURCE SIDE CUTOUT
INSTALLATION
LOAD SIDE CUTOUT
INSTALLATION
HOT-LINE/BAIL
INSTALLATION
BUSHING MOUNT
INSTALLATION
Source Side utout
Installation
Bushing Mount Installation
Hot-Line/Bail Installation
Load Side Cutout
Installation
Minimize energy let-through —
maximize equipment protection.
EXPULSION FUSE OPERATION
CURRENT-LIMITING FUSE OPERATION
Current
peak
Current
interruption
Current
interruption
Current
peak
Fuse Current
Fault Current
Energy Let-Through
Trans-Guard
®
EXT Current-
Limiting Backup Fuse
In addition to interrupting higher fault currents, the Trans-Guard
®
EXT
Current-Limiting Backup Fuse serves the very important function of limiting
the amount of energy let-through to the source of the fault to a value below
the withstand capability of the equipment being protected.
New and improved design offers you:
Smaller size and lighter weight for easier handling
Lowest energy let-through in the industry
The most complete range of ratings available
Lowest total I
2
t let-throughs in the industry provide
maximum protection for equipment by minimizing
energy let-through during a fault
Higher melt I
2
t’s on smaller fuse ratings make fuses
less susceptible to damage from current surges
High fault interrupting capability — as high as
50kA symmetrical
Shorter, lighter weight design makes fuses easy
to handle and install
Integral pre-assembled hardware reduces installation
time and likelihood of joint deterioration