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United States
Tel: 901.252.8000
Fax: 901.252.1354
Technical Services
Tel: 888.862.3289
FX Series Full-Range Current-Limiting Fuses
Power & High Voltage —
& Hi-Tech
Fuse Products
FX fuses are available in a broad range of
ratings. For ease of application, all designs are compatible
with the industry-recognized standard mounting codes.
Common applications include the Trans-Guard
Installed in drywell canisters for distribution
transformer protection (see Figure 1)
Clip mounted in live-front switchgear (see Figure 2)
Externally mounted on overhead distribution systems,
Type 4 (several outdoor versions available — contact factory
for more information)
Installed in Elastimold MCAN rubber molded canister
for deadfront/submersible applications (see
page H-79
Installed directly in oil, Type 8 (contact factory for more information)
Figure 1
FX Full-Range
Current-Limiting Fuse
This fuse provides both overload and fault current protection for distribution
equipment in a single fuse body. As a full-range fuse, it is capable of
interrupting any continuous current between the minimum current that can
cause melting of its elements and its rated maximum interrupting current
(50,000 amps).The fuses are capable of interrupting in elevated ambient
temperatures up to their rated maximum application temperature (RMAT).
The Trans-Guard
FX fuse is hermetically sealed and thus discharges no
gases during fuse operation. An additional design distinction is its patented
damage sensor that significantly reduces the potential for fuse failure in the
event of element-damaging current surges.
Patented damage sensor significantly reduces the risk
of fuse failure should the fuse be subjected to an
element-damaging current surge
Hermetically sealed construction ensures that no gases
escape from the fuse during current interruption
All Trans-Guard
FX fuses are helium mass spectrometer
leak tested to ensure sealing system integrity
Rugged machined brass end caps used for greater
ferrule strength, resulting in less distortion and more
secure fuse attachment in dry-well canisters
Tested in accordance with the most recent ANSI/
IEEE standards including short circuit testing at the
manufacturer’s specified rated maximum application
temperature (RMAT)
Optional blown fuse indicator features a unique design
that does not affect the fuse’s arcing performance
Figure 2