POWR-GARD® Fuse Datasheet
E-RATED POTENTIAL TRANSFORMER FUSES
Characteristics
Description
PotentialTransformer (PT) fuses are current-limiting fuses
with high interrupting ratings designed for the protection of
potential transformers.
Voltage Ratings
Current Range
625 Vac – 25,800 Vac
ꢀE – 10E
Application Note
Dimensions
When applying fuses for the protection of transformers,
the magnetizing current in-rush must be considered. The
characteristics of the in-rush, which can be matched with
a fuse time-current curve, should be available from the
transformer manufacturer.
B
A
ORDERING/CATALOG
NUMBER
LENGTH DIM. A
DIAMETER DIM. B
(INCHES)
MAX INTERRUPTING
RATING RMS (ASYM)*
SIZE
E-RATED
(INCHES)
3E4PT.6
5E4PT.6
7E4PT.6
10E4PT.6
500E4PT2.4
1E4PT2.4
3E
5E
7E
10E
ꢀE
1E
2E
1E
2E
3E
1E
2E
3E
1E
2E
ꢀE
1E
2E
3E
5E
ꢀE
1E
2E
3E
5E
10E
ꢀE
1E
4.6”
4.6”
4.6”
4.6”
4.6”
4.6”
4.6”
7.4”
0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
0.8125”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
0.8125”
0.8125”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
1.5625”
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
37,500
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
50,000
35,000
35,000
35,000
35,000
35,000
35,000
32,000
32,000
2E4PT2.4
1E6PT2.75
2E6PT2.75
3E6PT2.75
1E8PT2.75
2E8PT2.75
3E8PT2.75
1E5PT4.8
2E5PT4.8
500E6PT5.5
1E6PT5.5
2E6PT5.5
3E6PT5.5
5E6PT5.5
500E8PT5.5
1E8PT5.5
7.4”
7.4”
9.5”
9.5”
9.5”
5.6”
5.6”
7.4”
7.4”
7.4”
7.4”
7.4”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
9.5”
12.8”
12.8”
12.8”
12.8”
17.5”
17.5”
17.5”
17.5”
2E8PT5.5
3E8PT5.5
5E8PT5.5
10E8PT5.5
500E8PT8.25
1E8PT8.25
2E8PT8.25
3E8PT8.25
500E11PT15.5
1E11PT15.5
2E11PT15.5
3E11PT15.5
3E16PT15.5
5E16PT15.5
500E16PT25.5
1E16PT25.5
2E
3
ꢀE
1E
2E
3E
3E
5E
ꢀE
1E
* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6
© 2016 Littelfuse POWR-GARD® Products
Rev: 120816
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