Cut Sheet
POWR-GARD
®
Fuse Datasheet
littelfuse.com © 2016 Littelfuse POWR-GARD
®
Products
Rev: 120816
9 of 10
E-RATED POTENTIAL TRANSFORMER FUSES
A
B
Description
Potential Transformer (PT) fuses are current-limiting fuses
with high interrupting ratings designed for the protection of
potential transformers.
Application Note
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.
Characteristics
Voltage Ratings 625 Vac – 25,800 Vac
Current Range ½E – 10E
E-RATED
ORDERING/CATALOG
NUMBER
SIZE
LENGTH DIM. A
(INCHES)
DIAMETER DIM. B
(INCHES)
MAX INTERRUPTING
RATING RMS (ASYM)*
625
VOLT
3E4PT.6 3E 4.6” 0.8125” 37,500
5E4PT.6 5E 4.6” 0.8125” 37,500
7E4PT.6 7E 4.6” 0.8125” 37,500
10E4PT.6
10E 4.6” 0.8125” 37,500
2.75
MAX.
KV
500E4PT2.4
½E 4.6” 0.8125” 37,500
1E4PT2.4 1E 4.6” 0.8125” 37,500
2E4PT2.4
2E 4.6” 0.8125” 37,500
2.75
MAX. KV
1E6PT2.75
1E 7.4” 1.5625” 37,500
2E6PT2.75 2E 7.4” 1.5625” 37,500
3E6PT2.75 3E 7.4” 1.5625” 37,500
1E8PT2.75 1E 9.5” 1.5625” 37,500
2E8PT2.75 2E 9.5” 1.5625” 37,500
3E8PT2.75
3E 9.5” 1.5625” 37,500
4.8
MAX.
KV
1E5PT4.8
1E 5.6” 0.8125” 50,000
2E5PT4.8
2E 5.6” 0.8125” 50,000
5.5
MAX. KV
500E6PT5.5
½E 7.4” 1.5625” 50,000
1E6PT5.5 1E 7.4” 1.5625” 50,000
2E6PT5.5 2E 7.4” 1.5625” 50,000
3E6PT5.5 3E 7.4” 1.5625” 50,000
5E6PT5.5 5E 7.4” 1.5625” 50,000
500E8PT5.5 ½E 9.5” 1.5625” 50,000
1E8PT5.5 1E 9.5” 1.5625” 50,000
2E8PT5.5 2E 9.5” 1.5625” 50,000
3E8PT5.5 3E 9.5” 1.5625” 50,000
5E8PT5.5 5E 9.5” 1.5625” 50,000
10E8PT5.5
10E 9.5” 1.5625” 50,000
8.25
MAX.
KV
500E8PT8.25
½E 9.5” 1.5625” 50,000
1E8PT8.25 1E 9.5” 1.5625” 50,000
2E8PT8.25 2E 9.5” 1.5625” 50,000
3E8PT8.25
3 9.5” 1.5625” 50,000
15.5
MAX. KV
500E11PT15.5
½E 12.8” 1.5625” 35,000
1E11PT15.5
1E 12.8” 1.5625” 35,000
2E11PT15.5
2E 12.8” 1.5625” 35,000
3E11PT15.5
3E 12.8” 1.5625” 35,000
3E16PT15.5
3E 17.5” 1.5625” 35,000
5E16PT15.5
5E 17.5” 1.5625” 35,000
25.8
MAX.
KV
500E16PT25.5
½E 17.5” 1.5625” 32,000
1E16PT25.5
1E 17.5” 1.5625” 32,000
Dimensions
* RMS Asymmetrical amperes = RMS Symmetrical amperes x 1.6