POTENTIAL TRANSFORMER
3.6 kV – 38 kV FUSES
These are a range of fuses with low current rating, for use
with voltage transformers or operating transformers to pro-
vide isolation of the associated system in the event of faults
in the transformer circuit.
Advantages of Edison P.T. Fuses
Most fuses have two elements in parallel, ensuring satisfac-
tory operation at much smaller values of overcurrent than is
possible with single element fuse.
The elements are wound on a ceramic former, thus ensur-
ing correct spacing of the elements from the body wall and
from each other and hence giving assurance of correct
operation in service.
Switching (arc) voltages comply with the IEC282-1.
Application Notes
1. In order to minimize the risk of deterioration of the fine
fuse elements caused by corona, it is desirable to mount
the fuses so that grounded metal is not in the immediate
vicinity of the part of the barrel between the ferrules.
2. It is recommended that all three fuses are replaced when
the fuse in one or two phases has operated unless it is
definitely known that no overcurrent has passed through
the unmelted fuses.
“AB” & “AM” Series
Catalog
kV
Number
3.6
3.6ABWNA(amp)
3.6
3.6ABCNA(amp)
5.5
5.5ABWNA(amp)
5.5
5.5AMWNA(amp)
7.2
7.2ABWNA(amp)
7.2
7.2ABCNA(amp)
12.0
12ABCNA(amp)
15.5
15.5ABFNA(amp)
17.5
17.5ABGNA(amp)
24.0
24ABGNA(amp)
36.0*
36ABGNA(amp)
*For clean indoor applications only.
Ampere Ratings
3.15, 6.3
3.15, 6.3, 10
0.5E, 1.0E, 2.0E, 3.0E, 5.0E
0.5E, 1.0E, 2.0E, 3.0E, 5.0E
3.15, 6.3
3.15, 6.3
3.15
3.15
3.15
3.15
3.15
Type
AB
AB
AB
AM
AB
AB
AB
AB
AB
AB
AB
Dimensions (Figure 1)
Length
Diameter
5.6”
1”
7.69”
1”
5.6”
1”
5.6”
.81”
5.6”
1”
7.69”
1”
7.69”
1”
10.00”
1”
14.13”
1”
14.13”
1”
14.13”
1”
IR
50KA
“CAV” Series
kV
3.6
5.5
5.5
7.2
12
15.5
15.5
17.5
24
36
38
38
Catalog
Number
3.6CAV(amp)
5.5CAV(amp)
5.5CAVH(amp)
7.2CAV(amp)
12CAV(amp)
15.5CAV(amp)
15.5CAVH(amp)
17.5CAV(amp)
24CAV(amp)
36CAV(amp)
38CAV(amp)
38CAVH(amp)
Ampere Ratings
2
15E
0.5E, 1E, 2E
2, 10
2
0.5E, 1E, 2E, 3E, 7E
0.5E, 1E, 2E
2, 4, 6, 10
2, 3, 4
2, 4
4E
0.5E, 1E, 2E
Type
8CAV
7CAV
7CAVH
8CAV
8CAV
12CAV
12CAVH
8CAV
13CAV
17CAV
17CAV
17CAV
Dimensions (Figure 2)
Length
Diameter
8.66”
7.375”
7.375”
8.66”
8.66”
12.87”
1.63”
12.87”
8.66”
13.39”
17.32”
17.32”
17.32”
IR
40KA
129
POTENTIAL TRANSFORMER
3.6 kV – 38 kV FUSES
Dimensions (Type AB & AM)
FOR DIAMETER
SEE TABLE
.68"
17.3mm
1"
25.4mm
.21"
.5"
5.3mmø
12.7mm
.34"
8.6mm
FOR LENGTH SEE TABLE
0.63" (15.9mm) FOR AMWNA
1.26" (32.1mm) FOR ALL OTHERS
Figure 1
Dimensions (Type CAV)
1.37"
34.8mm
FOR DIAMETER
SEE TABLE
Ref. No. A3354705
1.18"
30.20mm
FOR LENGTH SEE TABLE
For 1” diameter potential trans-
former fuses.
Figure 2
Time/Current-Curves
(5.5kV AMWNA)
1,000
"E"
RATING
0.5
1.0
2.0
3.0
4.0
5.0
(5.5kV ABWNA & 15.5kV CAV)
1,000
"E"
RATING
0.5
1.0
2.0
3.0
100
100
TIME IN SECONDS
TIME IN SECONDS
10
10
1
1
.1
.1
.1
1
1,000
RMS SYMMETRICAL CURRENT IN AMPERES
RMS SYMMETRICAL CURRENT IN AMPERES
130
1,000
10
100
100
.01
.1
1
10
.01
