Table I. Electrical ratings.
1/
Secondary
Secondary dc
Turns ratio
Impedance
Power in watts
resistance
primary:secondary
Circuit
Primary
Primary
Primary
(ohms)
(ohms)
diagram
Dash
imped-
unbalanced
dc
configur
Series
Parallel
1 kHz
300 Hz
50 Hz
Series
Parallel
Secondary
Secondary
no.
ance
dc current
resistance
a-
connec-
connec-
and
and
and
connec-
connec-
series
parallel
(ohms)
(mA)
(ohms)
tion
tion
tion
higher
higher
higher
tion
tion
connection
connection
2.0
1.5
.03
001
20 ct
8 ct
2
22
1.6
.88
.22
1.58:1
3.16:1
A
2.0
1.5
.03
002
20 ct
20 ct
5
22
1.6
2.2
.55
1:1
2:1
"
2.0
1.5
.03
003
32 ct
32 ct
8
17.5
2.56
3.52
.88
1:1
2:1
"
2.0
1.5
.03
004
40 ct
40 ct
10
16
3.2
4.4
1.1
1:1
2:1
"
2.0
1.5
.03
005
48 ct
16 ct
4
14.5
3.84
1.76
.44
1.73:1
3.46:1
"
2.0
1.5
.03
006
50 ct
50 ct
12.5
14
4
5.5
1.38
1:1
2:1
"
2.0
1.5
.03
007
80 ct
32 ct
8
11
6.4
3.52
.88
1.58:1
3.16:1
"
2.0
1.5
.03
008
100 ct
40 ct
10
10
8
4.4
1.1
1.58:1
3.16:1
"
2.0
1.5
.03
009
100 ct
100 ct
25
10
8
11
2.75
1:1
2:1
"
2.0
1.5
.03
010
120 ct
12.8 ct
3.2
9
9.6
1.41
.35
3.06:1
6.12:1
"
2.0
1.5
.03
011
120 ct
60 ct
15
9
6.6
9.6
1.65
1.41:1
2.83:1
"
2.0
1.5
.03
012
120 ct
120 ct
30
9.6
9
13.2
3.3
1:1
2:1
"
2.0
1.5
.03
013
150 ct
12 ct
3
12
8
1.32
.33
3.54:1
7.08:1
"
2.0
1.5
.03
014
150 ct
50 ct
12.5
12
8
5.5
1.38
1.73:1
3.46:1
"
2.0
1.5
.03
015
150 ct
100 ct
25
12
8
11
2.75
1.22:1
2.44:1
"
2.0
1.5
.03
016
150 ct
150 ct
37.5
8
12
16.5
4.13
1:1
2:1
"
2.0
1.5
.03
017
150 ct
600 ct
150
8
12
66
16.5
1:2
1:1
"
2.0
1.5
.03
018
200 ct
200 ct
50
7
16
22
5.5
1:1
2:1
"
2.0
1.5
.03
019
300 ct
12 ct
3
5.5
24
1.32
.33
5:1
10:1
"
2.0
1.5
.03
020
300 ct
50 ct
12.5
5.5
24
5.5
1.38
2.45:1
4.9:1
"
2.0
1.5
.03
021
300 ct
150 ct
37.5
5.5
24
16.5
4.13
1.41:1
2.83:1
"
2.0
1.5
.03
022
300 ct
300 ct
75
5.5
24
33
8.25
1:1
2:1
"
2.0
1.5
.03
023
300 ct
600 ct
150
5.5
24
66
16.5
1.1:41
1.41:1
"
2.0
1.5
.03
024
320 ct
12.8 ct
3.2
5.5
25.6
1.41
.35
5:1
10:1
"
2.0
1.5
.03
025
400 ct
40 ct
10
5
32
4.4
1.1
3.16:1
6.23:1
"
2.0
1.5
.03
026
400 ct
120 ct
30
32
5
13.2
3.3
1.83:1
3.65:1
"
2.0
1.5
.03
027
400 ct
200 ct
50
32
5
22
5.5
1.41:1
2.83:1
"
2.0
1.5
.03
028
400 ct
400 ct
100
32
5
44
11
1:1
"
2:1
2.0
1.5
.03
029
400 ct
250
1000 ct
5
32
110
27.5
1:1.58
1.26:1
"
2.0
1.5
.03
030
400 ct
500
2000 ct
5
32
220
55
1:2.24
1:1.12
"
2.0
1.5
.03
031
400 ct
4000 ct
1000
5
32
440
110
1:3.16
1:1.58
"
2.0
1.5
.03
032
500 ct
12.8 ct
3.2
4.5
40
1.41
.35
6.25:1
12.5:1
"
2.0
1.5
.03
033
500 ct
16 ct
4
4.5
40
1.76
.44
5.6:1
11.2:1
"
2.0
1.5
.03
034
500 ct
50 ct
12.5
4.5
40
5.5
1.38
3.16:1
6.32:1
"
2.0
1.5
.03
035
500 ct
150 ct
37.5
4.5
40
16.5
4.13
1.83:1
3.65:1
"
2.0
1.5
.03
036
500 ct
500 ct
125
4.5
40
55
13.75
1:1
2:1
"
2.0
1.5
.03
037
500 ct
500 ct
---
4.5
40
55
---
1:1
---
B 2/
2.0
1.5
.03
038
A
500 ct
600 ct
150
4.5
40
66
16.5
1:1.1
1.83:1
2.0
1.5
.03
"
039
600 ct
12.8 ct
3.2
4
48
1.41
.35
6.85:1
13.7:1
2.0
1.5
.03
"
040
600 ct
30 ct
7.5
4
48
3.3
.83
4.47:1
8.94:1
See notes at end of table.
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