Current sensor transformer series

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Features

Frequency range: 60Hz to 1KHz
Primary Current range: 0 to 30A
Dielectric withstanding Voltage: 500-4000Vac
Optimum performance over designated current and frequency range
High Turns Ratio
Low cost

Applications

High resolution sonar currents
Isolated current feedback signal in switch mode power supplies
Monitor current load/overload
Lighting
Switch controls Ultra-sound currents
Security applications
High Frequency current Sensing

All series

A(mm)	B(mm)	C(mm)	Series spec
7.8±0.5	6.9±0.5	5.6 Max.	Spec

A(mm)

B(mm)

C(mm)

Series spec

7.8±0.5

6.9±0.5

5.6 Max.

Spec

Item	Unit	OWCST20T-E300	OWCST50T-E301	OWCST60T-E302	OWCST70T-E303	OWCST100T-E304	OWCST125T-E305	OWCST200T-E306
Turns Ratio(Kr)	–	1:20	1:50	1:60	1:70	1:100	1:125	1:200
Primary Current Max.	A(ac)	15	15	15	15	15	15	20
Lsec Min.	uH	80	500	730	980	2000	3000	8000
Test Condition	KHz mV	10KHz 0.1V	10KHz 0.1V	10KHz 0.1V	10KHz 0.1V	10KHz 0.1V	10KHz 0.1V	10KHz 0.1V
DCRsec. Max.	Ω	0.4	1.5	1.98	4.75	5.5	6.5	16.5
Frequency range	KHz	46KHz to 1MHz	20KHz to 1MHz	15KHz to 1MHz	13KHz to 1MHz	9KHz to 1MHz	7KHz to 1MHz	1KHz to 1MHz
Secondary Current Max.	mA	750	300	250	215	150	120	100
Rated Voltage	Vdc	80	80	80	80	80	80	80
Volt μS Max.	–	10.8	27	32	38	54	67.5	100
Hi-Pot Pri to Sec.	V(ac)	500V, 5mA 60”	500V, 5mA 60”	500V, 5mA 60”	500V, 5mA 60”	500V, 5mA 60”	500V, 5mA 60”	500V, 5mA 60”
Insulation Resistance	MΩ Min. 100Vac	500	500	500	500	500	500	500

Item

Unit

OWCST20T-E300

OWCST50T-E301

OWCST60T-E302

OWCST70T-E303

OWCST100T-E304

OWCST125T-E305

OWCST200T-E306

Turns Ratio(Kr)

–

1:20

1:50

1:60

1:70

1:100

1:125

1:200

Primary Current Max.

A(ac)

Lsec Min.

500

730

980

2000

3000

8000

Test Condition

KHz mV

10KHz 0.1V

DCRsec. Max.

0.4

1.5

1.98

4.75

5.5

6.5

16.5

Frequency range

KHz

46KHz to 1MHz

20KHz to 1MHz

15KHz to 1MHz

13KHz to 1MHz

9KHz to 1MHz

7KHz to 1MHz

1KHz to 1MHz

Secondary Current Max.

750

300

250

215

150

120

100

Rated Voltage

Vdc

Volt μS Max.

–

10.8

67.5

100

Hi-Pot Pri to Sec.

V(ac)

500V, 5mA 60”

Insulation Resistance

MΩ Min.
100Vac

500

A(mm)	B(mm)	C(mm)	Series spec
17.5 Max.	15.2 Max.	12.0 Max.	Spec

A(mm)

B(mm)

C(mm)

Series spec

17.5 Max.

15.2 Max.

12.0 Max.

Spec

Item	Unit	OWCST50T-B200	OWCST100T-B201	OWCST200T-B202	OWCST500T-B203	OWCST1000T-B204
Turns Ratio(Kr)	–	1:50	1:100	1:200	1:500	1:1000
Primary Current Max.	A(ac)	25	25	25	25	25
Lsec Min.	mH	4.7	18	76	470	1900
Test Condition	KHz mV	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V
DCRsec. Max.	Ω	0.5	2.0	4.5	16.0	50.0
Secondary Current Max.	mA	500	250	125	50	25
Volt μS Max.	–	175	350	700	1750	3500
Hi-Pot Pri to Sec.	V(ac)	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”
Insulation Resistance	MΩ Min. 500Vac	500	500	500	500	500

Item

Unit

OWCST50T-B200

OWCST100T-B201

OWCST200T-B202

OWCST500T-B203

OWCST1000T-B204

Turns Ratio(Kr)

–

1:50

1:100

1:200

1:500

1:1000

Primary Current Max.

A(ac)

Lsec Min.

4.7

470

1900

Test Condition

KHz mV

10KHz 0.01V

DCRsec. Max.

0.5

2.0

4.5

16.0

50.0

Secondary Current Max.

500

250

125

Volt μS Max.

–

175

350

700

1750

3500

Hi-Pot Pri to Sec.

V(ac)

4000V, 5mA 60”

Insulation Resistance

MΩ Min. 500Vac

500

A(mm)	B(mm)	C(mm)	Series spec
17.5 Max.	15.2 Max.	12.0 Max.	Spec

A(mm)

B(mm)

C(mm)

Series spec

17.5 Max.

15.2 Max.

12.0 Max.

Spec

Description	Specification	Comment
Rated Primary Current(A)	1A – 50A	–
Working Voltage Max.	300Vac Reinforced	OVC III, PD3,
Primary current of overload withstand	70A Max.	60” Min.
Working Frequency	50/60Hz	Sin.wave
Accuracy Classification	Class 0.2	at RL =50Ω
Linearity Error	≤0.5%	≤0.1 % typ. ( 1A to 50A)
Phase Error	≤1°	≤0.3° typ. (1A to 50A)
DCR of primary	≤0.2mΩ	–
DCR of secondary	≤60Ω	50Ω Typ.
Burden resistor (RL)	50Ω	Recommended
Maximum Voltage in Secondary output	3.0V Max.	–
Transformer Ratio on secondary output	60mV/A	RL=50Ω, f=50Hz
Dielectric Strength (Pri. To Sec.)	4000Vac	1mA 1”
Turns Ratio Ns: Np	1000:1	–

Description

Specification

Comment

Rated Primary Current(A)

1A – 50A

–

Working Voltage Max.

300Vac Reinforced

OVC III, PD3,

Primary current of overload withstand

70A Max.

60” Min.

Working Frequency

50/60Hz

Sin.wave

Accuracy Classification

Class 0.2

at RL =50Ω

Linearity Error

≤0.5%

≤0.1 % typ. ( 1A to 50A)

Phase Error

≤1°

≤0.3° typ. (1A to 50A)

DCR of primary

≤0.2mΩ

–

DCR of secondary

≤60Ω

50Ω Typ.

Burden resistor (RL)

50Ω

Recommended

Maximum Voltage in Secondary output

3.0V Max.

–

Transformer Ratio on secondary output

60mV/A

RL=50Ω, f=50Hz

Dielectric Strength (Pri. To Sec.)

4000Vac

1mA 1”

Turns Ratio Ns: Np

1000:1

–

A(mm)	B(mm)	C(mm)	Series spec
17.5 Max.	11.0 Max.	21.0 Max.	Spec

A(mm)

B(mm)

C(mm)

Series spec

17.5 Max.

11.0 Max.

21.0 Max.

Spec

Item	Unit	OWCST50T-H100	OWCST100T-H101	OWCST200T-H102	OWCST300T-H103	OWCST500T-H104	OWCST750T-H105
Turns Ratio(Kr)	–	1:50	1:100	1:200	1:300	1:500	1:750
Primary Current Max.	A(ac)	15	15	15	15	15	30
Lsec Min.	mH	5	22	89	200	560	1250
Test Condition	KHz mV	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V	10KHz 0.01V	1KHz 0.01V
DCRsec. Max.	Ω	0.6	1.1	4.5	10	25	43
Secondary Current Max.	mA	300	150	75	50	30	40
Volt μS Max.	–	175	350	700	900	1500	3750
Hi-Pot Pri to Sec.	V(ac)	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”	4000V, 5mA 60”
Insulation Resistance	MΩ Min. 500Vac	500	500	500	500	500	500

Item

Unit

OWCST50T-H100

OWCST100T-H101

OWCST200T-H102

OWCST300T-H103

OWCST500T-H104

OWCST750T-H105

Turns Ratio(Kr)

–

1:50

1:100

1:200

1:300

1:500

1:750

Primary Current Max.

A(ac)

Lsec Min.

200

560

1250

Test Condition

KHz mV

10KHz 0.01V

1KHz 0.01V

DCRsec. Max.

0.6

1.1

4.5

Secondary Current Max.

300

150

Volt μS Max.

–

175

350

700

900

1500

3750

Hi-Pot Pri to Sec.

V(ac)

4000V, 5mA 60”

Insulation Resistance

MΩ Min.
500Vac

500

A(mm)	B(mm)	C(mm)	Series spec
12.8±0.5	37.0±0.5	39.0±0.5	Spec

A(mm)

B(mm)

C(mm)

Series spec

12.8±0.5

37.0±0.5

39.0±0.5

Spec

Description	Specification	Comment
Rated Primary Current(A)	0A – 100A	AC input current to be linearly sensed
Working Voltage Max.	300Vac Reinforced	OVC III, PD3,
Primary current of overload withstand	120A Max.	60” Min.
Working Frequency	50Hz – 1kHz	Sin.wave
Accuracy Classification	Class 0.2	at RL =50Ω
Amplitube Error	≤0.2%	≤0.1 % typ. ( 0A to 120A)
Phase Error	≤20Minutes	≤0.3° typ. (1A to 50A)
DCR of secondary	57Ω Typ.	25℃
Burden resistor (RL)	100Ω	Recommended
Maximum Voltage in Secondary output	10V Max.	Saturation Point
Transformer Ratio on secondary output	60mV/A	RL=50Ω, f=50Hz
Dielectric Strength (Pri. To Sec.)	4000Vac	1mA 1”
Turns Ratio Ns: Np	2500:1	–

Description

Specification

Comment

Rated Primary Current(A)

0A – 100A

AC input current to be linearly sensed

Working Voltage Max.

300Vac Reinforced

OVC III, PD3,

Primary current of overload withstand

120A Max.

60” Min.

Working Frequency

50Hz – 1kHz

Sin.wave

Accuracy Classification

Class 0.2

at RL =50Ω

Amplitube Error

≤0.2%

≤0.1 % typ. ( 0A to 120A)

Phase Error

≤20Minutes

≤0.3° typ. (1A to 50A)

DCR of secondary

57Ω Typ.

25℃

Burden resistor (RL)

100Ω

Recommended

Maximum Voltage in Secondary output

10V Max.

Saturation Point

Transformer Ratio on secondary output

60mV/A

RL=50Ω, f=50Hz

Dielectric Strength (Pri. To Sec.)

4000Vac

1mA 1”

Turns Ratio Ns: Np

2500:1

–

A(mm)	B(mm)	C(mm)	Series spec
31.0±0.5	9.5±0.5	32.0±0.5	Spec

A(mm)

B(mm)

C(mm)

Series spec

31.0±0.5

9.5±0.5

32.0±0.5

Spec

Description	Specification	Comment
Rated Primary Current(A)	10mA – 1A	Frequency : 50/60Hz
Turns Ratio Ns: Np	Ns1: Ns2 = 1:1000:5	Through-Hole type
DCR of Ns1	55Ω Max.	25℃
Hi-pot	4000Vac /1Ma/60”	–
Insulation Resistance	100MΩ Min.	500Vdc
RL for NS1	≤100Ω	For output voltage test
Current in NS2	125mA Max.	5mA Max per turn

Description

Specification

Comment

Rated Primary Current(A)

10mA – 1A

Frequency : 50/60Hz

Turns Ratio Ns: Np

Ns1: Ns2 = 1:1000:5

Through-Hole type

DCR of Ns1

55Ω Max.

25℃

Hi-pot

4000Vac /1Ma/60”

–

Insulation Resistance

100MΩ Min.

500Vdc

RL for NS1

≤100Ω

For output voltage test

Current in NS2

125mA Max.

5mA Max per turn

Current sensor transformer series

Features

Applications

All series

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Ole Wolff Elektronik A/S