E Rated Potential Transformer Fuses
Current Limiting
Potential Transformer (PT) fuses are current limiting fuses
with high interrupting ratings designed for the protection of
potential transformers.
CHARACTERISTICS
Voltage Rating: 600VAC – 25,500 VAC
Current Range: 1/2E – 10E
Application Note:
When applying fuses for the protection of transformers,
the magnetizing current inrush must be considered. The
characteristics of the inrush, which can be matched with
a fuse’s time-current curve, should be available from the
transformer manufacturer.
B
A
Max
Interrupting
Rating
Old
Catalog
Number
Length
Dim. A
(inches)
Diameter
Dim. B
(inches)
E
Catalog
Number
3E-4PT-6
5E-4PT-6
7E-4PT-6
10E-4PT-6
PT
Size
RMS (Asym)
3E
5E
7E
4.625
4.625
4.625
4.625
0.8125
0.8125
0.8125
0.8125
62,500
62,500
62,500
62,500
10E
500E-4PT-2.4
1E-4PT-2.4
2E-4PT-2.4
1/2E
1E
2E
4.625
4.625
4.625
0.8125
0.8125
0.8125
40,000
40,000
40,000
LCD 1E-4
LCD 2E-4
1E-6PT-2.75
2E-6PT-2.75
3E-6PT-2.75
1E
2E
3E
7.375
7.375
7.375
1.625
1.625
1.625
37,500
37,500
37,500
1E-8PT-2.75
2E-8PT-2.75
3E-8PT-2.75
1E
2E
3E
9.5
9.5
9.5
1.625
1.625
1.625
50,000
50,000
50,000
1E-5PT-4.8
2E-5PT-4.8
LCE 1E-4
LCE 2E-4
1E
2E
5.5
5.5
0.8125
0.8125
50,000
50,000
1/2E-6PT-5.5
1E-6PT-5.5
2E-6PT-5.5
3E-6PT-5.5
5E-6PT-5.5
1/2E
1E
2E
3E
5E
7.375
7.375
7.375
7.375
7.375
1.625
1.625
1.625
1.625
1.625
37,500
37,500
37,500
37,500
37,500
1/2E-8PT-5.5
1E-8PT-5.5
2E-8PT-5.5
3E-8PT-5.5
5E-8PT-5.5
10E-8PT-5.5
LCQ .5E
LCQ 1E
LCQ 2E
LCQ 3E
LCQ 5E
LCQ 10E
1/2E
1E
2E
3E
5E
9.5
9.5
9.5
9.5
9.5
9.5
1.625
1.625
1.625
1.625
1.625
1.625
37,500
37,500
37,500
37,500
37,500
37,500
10E
1/2E-8PT-8.25
1E-8PT-8.25
2E-8PT-8.25
3E-8PT-8.25
1/2E
1E
2E
9.5
9.5
9.5
9.5
1.625
1.625
1.625
1.625
50,000
50,000
50,000
50,000
3E
1/2E-11PT-15.5
1E-11PT-15.5
2E-11PT-15.5
3E-11PT-15.5
LCT .5E
LCT 1E
LCT 2E
LCT 3E
1/2E
1E
2E
12.875
12.875
12.875
12.875
1.625
1.625
1.625
1.625
80,000
80,000
80,000
80,000
3E
3E-16PT-15.5
5E-16PT-15.5
3E
5E
17.5
17.5
1.625
1.625
80,000
80,000
1/2E-16PT-25.5
1E-16PT-25.5
LCJ 1E-4
LCJ 2E-4
1/2E
1E
17.5
17.5
1.625
1.625
43,500
43,500
72