Transformers/Choke Coils
Current Transformers
Outline
TOKIN current transformers are compact, highly sensi-
tive AC current detectors for mounting on printed cir-
cuit boards.
Features
•
•
•
•
Compact, inexpensive, and have high output voltages.
Broad-frequency bandwidths (50 Hz to 100 kHz).
Easy mounting on printed circuit boards.
Use flame-retardant materials (UL94V-0 class).
Applications
• Electromagnetic cooking appliances, microwave ov-
ens, air-conditioners and other home appliances
• Current regulation in OA equipment and industrial
equipment
• High-frequency switching power supplies
Product Names and Composition
Primary pass-through type
Vertical type
–
CT10 Series
–
–
CT19 Series
CT25 Series
–
CT25V-30
Horizontal type
–
–
–
–
CT25H-30
Primary mounted type
Vertical type
CT10V1-02
CT10V1-15
CT10V1-10S
–
CT25V1-30
Horizontal type
CT10H1-02
CT10H1-15
–
CT19H1-40
CT25H1-30
Output Voltage Measurement Circuit
I
1
f
P
S
R
L
Eo
Markings
Example)
CT10 V
1 - 15
Number of windings 1500
T
Primary pass-through type or
Primary mounted type (1)
Vertical type (V) or Horizontal
type (H)
Series
CT
f
I
1
R
L
Eo
: Frequency
: Primary current (AT)
: Load resistor (Ω)
: Output voltage (V)
P : Primary side
S : Secondary side
26
CT-10 Series
Shape and Dimensions
CT10V1-02
CT10V1-15
CT10H1-02
CT10H1-15
CT10V1-10S
(mm)
19 max.
15.5 max.
19 max.
17.5 max. 5.0
20.5 max.
16 max.
21 max.
22 max.
2
4
25 max.
8.5
5.0
1 2 3 4
9.5
2-φ0.7
1 3 2 4
8.5
φ1.2
1
3
2-φ0.7
1 2
φ1.6
3 4
11.0
2-φ0.8
1 3
9
2 4
9.5
φ1.2
<Top View>
<Top View>
<Top View>
2
1
2-φ1.8
9.5
4
8.5
3
1
P
2
2-φ1.1
S
3
4
2-φ1.8
2
1
9.5
4
8.5
3
2-φ1.1
1
P
2
S
3
4
2-φ2.2
2
1
11
4
3
9
1
P
2
2-φ1.2
S
3
4
Characteristics and Specifications
Product name
Direct current resistance
(Ω)
max.
CT10V1-02
CT10H1-02
3.9
CT10V1-15
CT10H1-15
230
CT10V1-10S
160
3750 / 1 min. resist
(inter-coil, between coil and core)
Insulation withstand voltage (VAC/1 min)
Insulation resistance
Safety standard (s) met
(MΩ)
min.
1500 / 1 min. resist
(inter-coil, between coil and core)
100 at 500 VDC mega (inter-coil, between coil and core)
UL
UL, IEC, VDE
Output Voltage Characteristics
f = 40kHz
N
2
= 200T
f = 50Hz
N
2
= 1500T
0
Ω
0
Ω
50
E
0
(V)
5
E
0
(V)
2.5
E
0
(V)
2
1.5
1
0.5
f = 50Hz
N
2
= 1000T
80
Ω
4
L=
R
2
1.5
=
RL
0
10
RL
0
=1
00
Ω
50
0
Ω
3
2
1
0
Ω
40
20
Ω
1
0.5
0
5
200
Ω
200
Ω
5
10 I
I
(AT)
10 I
I
(AT)
0
5
10 I
I
(AT)
27
Transformers/Choke Coils
CT-25 Series
Shape and Dimensions
CT25V-30
29 max.
10 min.
5.0 min.
(mm)
CT25V1-30
19.5 max.
29 max.
19.5 max.
33 max.
21 max.
3.0
33 max.
1 2
15.0
3 4
1 3
2 4
4-φ0.8
S
3
4
1 2
φ1.5
2
1
2-φ2.0
3 4
2-φ0.8
4
12.5
1 3
12.5
1
P
2
2 4
12.5
4
12.5
11.5
<Top View>
2
1
4-φ1.2
<Top View>
3
S
4
3
15.0
1, 2 Hollow pin
3
11.5
2-φ1.2
CT25H-30
29 max.
10 min.
5.0 min,
CT25H1-30
22 max. 3.0
29 max.
22 max. 3.0
32 max.
2
4
12.5
32 max.
2
4
12.5
1
3
4-φ0.8
φ1.5
1
2
3
11.5
4
2-φ0.8
1
12.5
15.0
12.5
3
P
S
4
<Top View>
2
1
4-φ1.2
4
S
3
15
2
1
3, 4 Hollow pin
<Top View>
1
2-φ2.0
3
11.5
2
2-φ1.2
Characteristics and Specifications
Product name
Direct current resistance
(Ω)
max.
CT25V-30
CT25H-30
600
1500 VAC / 1 min. resist
(inter-coil, between coil and core)
min.
100 at 500 VDC mega
(inter-coil, between coil and core)
UL
CT25V1-30
CT25H1-30
620
1500 VAC / 1 min. resist
(inter-coil, between coil and core)
100MΩ / min. at 500 VDC mega
(inter-coil, between coil and core)
UL
Insulation withstand voltage (VAC/1 min)
Insulation resistance
Safety standard (s) met
(MΩ)
Output Voltage Characteristics
E
0
(V) 10
8
6
4
2
5
10
00
Ω
20
E
0
(V) 10
8
L=
RL
RL
=1
0
00
Ω
f=60Hz
6
4
f=50Hz
2
R
0
Ω
=50
15
20 I
I
(AT)
5
10
15
20 I
I
(AT)
Output voltage characteristics (f=50 Hz)
according to differences in terminal resistance (R
L
)
Output voltage characteristics (R
L
= 1000Ω)
according to differences in wave frequency
28
CT-19 Series
Shape and Dimensions
20.5
max.
19.5
max.
(mm)
22
max.
3.5
+2
–1
10
5
5
φ1.3 ×
3
NC
φ1.4
+0.2
×2
–0
10
φ0.8
+0.2
×3
–0
(2.5)
(S)
1
P
2
S
3
4
φ1.9 ×
2
Characteristics and Specifications
Product name
Direct current resistance
(Ω)
max.
CT19H1-40
3300
1500VAC / 1 min. resist (inter-coil, between coil and core)
min.
100 at 500 VDC mega (inter-coil, between coil and core)
UL, IEC
Insulation withstand voltage (VAC/1 min)
Insulation resistance
Safety standard (s) met
(MΩ)
Output voltage Characteristics
15
R
L
=3k
Ω
Voltage Eo (V)
10
(5.5)
(P)
10
R
L
=2k
Ω
5
R
L
=1k
Ω
0
0
5
10
15
Current I
t
(A)
20
29
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