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.
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鈥檚 time-current curve, should be available from the
transformer manufacturer.
CHARACTERISTICS
Voltage Rating:
600VAC 鈥?25,500 VAC
Current Range:
1/2E 鈥?10E
B
A
E
PT
Catalog
Number
3E-4PT-6
5E-4PT-6
7E-4PT-6
10E-4PT-6
500E-4PT-2.4
1E-4PT-2.4
2E-4PT-2.4
1E-6PT-2.75
2E-6PT-2.75
3E-6PT-2.75
1E-8PT-2.75
2E-8PT-2.75
3E-8PT-2.75
1E-5PT-4.8
2E-5PT-4.8
1/2E-6PT-5.5
1E-6PT-5.5
2E-6PT-5.5
3E-6PT-5.5
5E-6PT-5.5
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
1/2E-8PT-8.25
1E-8PT-8.25
2E-8PT-8.25
3E-8PT-8.25
1/2E-11PT-15.5
1E-11PT-15.5
2E-11PT-15.5
3E-11PT-15.5
3E-16PT-15.5
5E-16PT-15.5
1/2E-16PT-25.5
1E-16PT-25.5
Old
Catalog
Number
Size
3E
5E
7E
10E
1/2E
1E
2E
1E
2E
3E
1E
2E
3E
Length
Dim. A
(inches)
4.625
4.625
4.625
4.625
4.625
4.625
4.625
7.375
7.375
7.375
9.5
9.5
9.5
5.5
5.5
7.375
7.375
7.375
7.375
7.375
9.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
9.5
12.875
12.875
12.875
12.875
17.5
17.5
17.5
17.5
Diameter
Dim. B
(inches)
0.8125
0.8125
0.8125
0.8125
0.8125
0.8125
0.8125
1.625
1.625
1.625
1.625
1.625
1.625
0.8125
0.8125
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
1.625
Max
Interrupting
Rating
RMS (Asym)
62,500
62,500
62,500
62,500
40,000
40,000
40,000
37,500
37,500
37,500
50,000
50,000
50,000
50,000
50,000
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
80,000
80,000
80,000
80,000
80,000
80,000
43,500
43,500
2.4
Max.
KV
600
Volt
LCD 1E-4
LCD 2E-4
4.8
Max.
KV
2.75
Max.
KV
LCE 1E-4
LCE 2E-4
1E
2E
1/2E
1E
2E
3E
5E
1/2E
1E
2E
3E
5E
10E
1/2E
1E
2E
3E
5.5
Max.
KV
LCQ .5E
LCQ 1E
LCQ 2E
LCQ 3E
LCQ 5E
LCQ 10E
8.25
Max.
KV
25.5
Max.
KV
15.5
Max.
KV
LCT .5E
LCT 1E
LCT 2E
LCT 3E
1/2E
1E
2E
3E
3E
5E
1/2E
1E
LCJ 1E-4
LCJ 2E-4
72
LITTELFUSE
1
