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Tandem ELF current-limiting dropout fuse installation instructions
INSTALLATION INSTRUCTIONS
MN132029EN November 2016
Handling and storage
If the Tandem ELF fuse is to be stored for an appreciable
time before installation, provide a clean, dry storage
area. Locate the Tandem ELF fuse so as to minimize the
possibility of physical damage.
Quality Standards
ISO 9001-Certified Quality Management System
Application
When selecting the proper size Tandem ELF fuse for each
installation; transformer current, system voltage, and
upstream coordination should be taken into account.
The Tandem ELF fuse uses the 25 K Companion II backup
current-limiting fuse. This Companion II fuse rating indicates
the largest Type K-rated fuse link that properly coordinates
with the fuse. The highest current ratings for other fuse link
types that will properly coordinate with the Tandem ELF
backup current-limiting fuse are shown in Table 1.
The voltage ratings recommended for the Tandem ELF fuse
on most commonly encountered distribution systems are
listed in Table 2.
For further information concerning the coordination of the
Tandem ELF fuse see Eaton’s Cooper Power series catalog
section CA132028EN or contact your Eaton representative.
Installation procedure
The Tandem ELF fuse is shipped only with the backup
current-limiting fuse installed. Remove the fuse link (if
supplied and of the proper rating) from the package and
install into Tandem ELF fuse following the instructions below:
otee:
N
If the fuse link is not supplied, select the correct fuse
link ampere size based on the application section in
catalog section CA132028EN and with the current
rating for the respective fuse link type selected not
to exceed the values shown in Table 1 of
these instructions.
Table 2 . Tandem ELF Fuse Voltage Application
System voltage (kV)
Recommended Tandem ELF fuse
Voltage class rating (kV)
Nominal
Maximum
Wye
Delta
2.4
2.54
–
15
2.4/4.16
2.54/4.4
15
–
4.16
4.4
–
15
4.8
5.1
–
15
4.8/8.32
5.1/8.8
15
–
6.9
7.26
–
15
6.93/12.0
7.3/12.7
15
–
7.2
7.62
–
15
7.2/12.47
7.62/13.2
15
–
7.62
8.1
–
15
7.62/13.2
8.1/14.0
15
–
7.97
8.4
–
15
7.97/13.8
8.4/14.5
15
–
8.32
8.8
–
15
8.32/14.4
8.8/15.2
15
–
12/20.8
12.7/22.0
27
–
12.47
13.2
–
15*
13.2/22.9
14/24.2
27
–
13.2
13.9
–
15*
13.8
14.5
–
15*
14.4/24.9
15.2/26.4
27
–
14.4
15.2
–
15*
23.0
24.3
–
27*
* For single-phase applications on delta systems, one Tandem ELF fuse of this rating
is required in each phase.
Fuse
Cap
Fuse link holder
Middle
connector
Lifting
eye
Backup
current-
limiting
fuse
Figure 2 . Tandem ELF fuse link holder assembly
