Current Transducer CTSR-P/SP10 series IP R N = 300, 600 mA
Ref: CTSR 0.3-P/SP10, CTSR 0.6-P/SP10
For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between
the primary and the secondary circuit.

Features

Applications● Closed loop (compensated) current transducer● Residual current measurement● Voltage output● Leakage current measurement in transformerless PV● Single supply voltage● PCB mounting.

R RM

R feature
SpecialRM winding included.
● TestR

Advantages

R

inverters● First human contact protection of PV arrays

UC● Failure detection in power sources● Symmetrical fault detection (e.g. after motor inverter)

Uref● Leakage current detection in stacked DC sources

Uout● Single phase or three phase nominal current measurement
up to ±30 A per wire (DC or AC).

● High accuracy● Very low offset drift over temperatureStandards● Wide aperture● EN 50178: 1997

● High overload capability● IEC 61010-1: 2010

● High insulation capability● Reference pin with two modes, Ref In and Ref Out● Degauss and test functions.

● UL 508: 2010.

Application Domains● Industrial● Suitable to fulfil VDE 0126-1-1, UL 1741 and IEC 62109-2.

N°97.G9.A2.010.0, N°97.G9.G6.010.0
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CTSR-P/SP10 Series

Safety⚠

CautionIf the device is used in a way that is not specified by the manufacturer, the protection provided by the device may be compromised.
Always inspect the electronics unit and connecting cable before using this product and do not use it if damaged.
Mounting assembly shall guarantee the maximum primary conductor temperature, fulfill clearance and creepage distance,
minimize electric and magnetic coupling, and unless otherwise specified can be mounted in any orientation.

Caution, risk of electrical shock
This transducer must be used in limited-energy secondary circuits SELV according to IEC 61010-1, in electric/electronic equipmentwith respect to applicable standards and safety requirements in accordance with the manufacturer’s operating specifications.
Use caution during installation and use of this product; certain parts of the module can carry hazardous voltages and high currents(e.g. power supply, primary conductor).
Ignoring this warning can lead to injury and or/or cause serious damage.
De-energize all circuits and hazardous live parts before installing the product.
All installations, maintenance, servicing operations and use must be carried out by trained and qualified personnel practicing
applicable safety precautions.
This transducer is a build-in device, whose hazardous live parts must be inaccessible after installation.
This transducer must be mounted in a suitable end-enclosure.
Besides make sure to have a distance of minimum 30 mm between the primary terminals of the transducer and other neighboring
components.
Main supply must be able to be disconnected.
Always inspect the flexible probe for damage before using this product.
Never connect or disconnect the external power supply while the primary circuit is connected to live parts.
Never connect the output to any equipment with a common mode voltage to earth greater than 30 V.
Always wear protective clothing and gloves if hazardous live parts are present in the installation where the measurement is carriedout.
This transducer is a built-in device, not intended to be cleaned with any product. Nevertheless if the user must implement cleaning
or washing process, validation of the cleaning program has to be done by himself.
When defining soldering process, please use no cleaning process only.

ESD susceptibility
The product is susceptible to be damaged from an ESD event and the personnel should be grounded when handling it.
Do not dispose of this product as unsorted municipal waste. Contact a qualified recycler for disposal.

Underwriters Laboratory Inc. recognized component

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CTSR-P/SP10 Series

Absolute maximum ratings
Parameter

Symbol

Unit

Value

Maximum supply voltage

UC maxV

7

Maximum primary conductor temperature

TB max°C

110

Maximum Primary withstand peak current (100 µs,
500 A/µs)

ÎP maxA

3300

Maximum Voltage between test winding andsecondary pins

Ud maxV

35

Maximum Current of test winding

IT maxmA

300

Stresses above these ratings may cause permanent damage. Exposure to absolute maximum ratings for extended periods may
degrade reliability.

UL 508: Ratings and assumptions of certification
File # E189713 Volume: 2 Section: 3Standards● CSA C22.2 NO. 14-10 INDUSTRIAL CONTROL EQUIPMENT - Edition 11 - Revision Date 2011/08/01● UL 508 STANDARD FOR INDUSTRIAL CONTROL EQUIPMENT - Edition 17 - Revision Date 2010/04/15
Ratings
Parameter

SymbolPrimary involved potential*

Unit

Value Version P

V AC/DC600

Max surrounding air temperature

TA

°C

105

Primary current

IP

A

30

Secondary supply voltage

UC

V DC

5

Output voltage

Uout

V

0 to 5* Enviromental: For use in Pollution degree 2.
Conditions of acceptability
When installed in the end-use equipment, consideration shall be given to the following:
1 - A suitable enclosure shall be provided in the end-use application.
5 - CTSR series is intended to be mounted on the printed wiring board of the end-use equipment.
7 - The uninsulated live parts of primary feeder and secondary circuit clearance spacing of Model CTSR XX-P series shallmaintain at least 5.5 mm apart.
8 - Primary feeder of the devices shall be connected after an overvoltage device or system which has been evaluated by theStandard for Transient Voltage Surge Suppressors, UL 1449.
Marking
Only those products bearing the UL or UR Mark should be considered to be Listed or Recognized and covered under UL's
Follow-Up Service. Always look for the Mark on the product.
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CTSR-P/SP10 Series

Insulation coordination
Parameter

Symbol

Unit

Value

RMS voltage for AC insulation test, 50 Hz, 1 min

Ud

kV

5.4

Impulse withstand voltage 1.2/50 µs

UNi

kV

10.1

Partial discharge RMS test voltage (qm < 10 pC)

Ut

kV

1.65

Clearance (pri. - sec.)

dCI

mm

11

Shortest distance throughair

Creepage distance (pri. - sec.)

dCp

mm

11

Shortest path along device
body

-

-

V0 according
to UL 94

Case material
Comparative tracking index

CTI

Application example-

Application example

Comment

600
V

1000

Reinforced insulation, CAT
III, PD2 non uniform fieldaccording to EN 50178

600

Reinforced insulation, CAT
III, PD3 non uniform fieldaccording to EN 50178,
IEC 61010-

V

SymbolUnit

Min

Ambient operating temperature

TA

°C

−40

105

Ambient storage temperature

TA st

°C

−50

105

Mass

m

g

Environmental and mechanical characteristics
Parameter

Typ

Max

Comment

28

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CTSR-P/SP10 Series

Electrical data CTSR 0.3-P/SP10

At TA = 25 °C, UC = +5 V, output voltage referred to Uref, unless otherwise noted (see Min., Max., typical definition paragraph) in
page 9.

Parameter

SymbolUnit

Min

Primary nominal residual RMS current

IP R NmA

Primary residual current, measuring range

IP R M

mA−500

Supply voltage

UC

V

4.75

Current consumption

IC

Output voltage referred to GND(during Degauss cycle)

Typ

Max

Comment

300
500
5

5.25

mA

17.5

21.6

+IP (mA)/NS
With NS = 1000 turns−40 ... 105 °C

Uout

V

0.3

0.5

1)

Output voltage referred to Uref
(Test current)

Uout

V

1.2

1.7

1)

Reference voltage @ IP = 0

Uref

V

2.495

2.5

2.505

External reference voltage

Uref

V

2.3

Electrical offset current
referred to primary 2)

IO E

mA

−24

Temperature coefficient of Uref @ IP = 0

TCUrefppm/K±50−40 ... 105 °C

Temperature coefficient of UO E @ IP = 0

TCUO E

ppm/K

±570

ppm/K of 2.5 V−40 ... 105 °C

Nominal sensitivity

SN

V/A

Sensitivity error 2)

εS

%

−1.6

1.6

RL > 500 kΩ

Sensitivity error with testing winding

εS

%

−3

3

RL > 500 kΩ

Temperature coefficient of S

TCS

ppm/K

Linearity errorεL% of IP R M

Number of turns (test winding)NT

Test current, measuring range

IT M

mA

Magnetic offset current (1000 x IP R N)
referred to primary

IO M

mA

17

RMS noise voltage(1 Hz ... 10 kHz)

Uno

mV

6

RL > 500 kΩ

Delay time to 10 % to the final output value
for IP N step

tD 10

µs

7

RL > 500 kΩ,
di/dt > 5 A/µs

Delay time to 90 % to the final output value
for IP N step

tD 90

µs

50

RL > 500 kΩ,
di/dt > 5 A/µs

Frequency bandwidth (−1 dB)

BW

kHz

3.5

RL > 500 kΩ

Error 3)ε%Notes:

4
7

Internal reference
Internal reference ofUref input = 499 Ω 1)

24

4
0.5

±230
±400
0.5

−40 ... 105 °C

1

20
−25

25

1.9

= (εS2 + εL2)1/2

See “Application information” section.
Only with a primary nominal residual current, see paragraph “Primary nominal residual current and primary nominal		 current”.
3)
Total error @ TA and IP: εtot (TA) = (ε2 + (TCS × 100 × (TA − 25))2 + (TCUO E × 2.5 × (TA − 25)/SN × 100/IP)2)1/2.
1)
2)

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CTSR-P/SP10 Series

Phase (°)

Relative sensitivity (dB)

Typical performance characteristics CTSR 0.3-P/SP10

Frequency (Hz)Uno (V)uno (dBV RMS/rtHz)

Figure 1: Frequency response

Figure 2: Noise voltage spectral density

Figure 3: RMS noise voltage

Figure 4: Typical step response

Figure 5: Typical step response

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CTSR-P/SP10 Series

Electrical data CTSR 0.6-P/SP10

At TA = 25 °C, UC = +5 V, output voltage referred to Uref, unless otherwise noted (see Min., Max., typical definition paragraph) in
page 9.

Parameter

SymbolUnit

Min

Primary nominal residual RMS current

IP R NmA

Primary residual current, measuring range

IP R M

mA−850

Supply voltage

UC

V

4.75

Current consumption

IC

Output voltage referred to GND(during Degauss cycle)

Typ

Max

Comment

600
850
5

5.25

mA

17.5

21.6

+IP (mA)/NS
With NS = 1000 turns−40 ... 105 °C

Uout

V

0.3

0.5

1)

Output voltage referred to Uref
(Test current)

Uout

V

0.75

1.1

1)

Reference voltage @ IP = 0

Uref

V

2.495

2.5

2.505

External reference voltage

Uref

V

2.3

Electrical offset current
referred to primary 2)

IO E

mA

−24

Temperature coefficient of Uref @ IP = 0

TCUrefppm/K±50−40 ... 105 °C

Temperature coefficient of UO E @ IP = 0

TCUO E

ppm/K

±520

ppm/K of 2.5 V−40 ... 105 °C

Nominal sensitivity

SN

V/A

Sensitivity error

εS

%

−0.7

0.7

RL > 500 kΩ

Sensitivity error with testing winding

εS

%

−3

3

RL > 500 kΩ

Temperature coefficient of S

TCS

ppm/K

±100

−40 ... 105 °C

Linearity errorεL% of IP R M

Number of turns (test winding)NT

Test current, measuring range

IT M

mA

Magnetic offset current (1000 x IP R N)
referred to primary

IO M

mA

17

RMS noise voltage(1 Hz ... 10 kHz)

Uno

mV

4

RL > 500 kΩ

Delay time to 10 % to the final output value
for IP N step

tD 10

µs

5

RL > 500 kΩ,
di/dt > 5 A/µs

Delay time to 90 % to the final output value
for IP N step

tD 90

µs

30

RL > 500 kΩ,
di/dt > 5 A/µs

Frequency bandwidth (−1 dB)

BW

kHz

9.5

RL > 500 kΩ

Error

ε

%

3)

Notes:

2)

4
4.2

Internal reference
Internal reference ofUref input = 499 Ω 1)

24

2.476
0.3

0.4

1.3

20
−42.5

42.5

1.5

= (εS2 + εL2)1/2

See “Application information” section.
Only with a primary nominal residual current, see paragraph “Primary nominal residual current and primary nominal		 current”.
3)
Total error @ TA and IP: εtot (TA) = (ε2 + (TCS × 100 × (TA − 25))2 + (TCUO E × 2.5 × (TA − 25)/SN × 100/IP)2)1/2.
1)
2)

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CTSR-P/SP10 Series

Phase (°)

Relative sensitivity (dB)

Typical performance characteristics CTSR 0.6-P/SP10

Frequency (Hz)Figure 6: Frequency response

Noise voltage spectral density of V M
Device: CTSR 0.6-P #05-61-60

Cumulated RMS noise voltage of V M
Device: CTSR 0.6-P #05-61

-1

10

-2

10

-70
-75

-3

10
V (V)

-80

Uno (V)n-85nuno (dBV
RMS/rtHz)v (dBVrms/rtHz)

-65

-90
-95

-4

10

-5

10

-100
-105
-110
0
10

-6

1

10

3

2

10

f (Hz)

10

4

10

5

10

10

0

10

1

10

3

2

10

fc (Hz)Figure 7: Noise voltage spectral density

Figure 8: RMS noise voltage

Figure 9: Typical step response

Figure 10: Typical step response

10

4

10

5

10

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Definition of typical, minimum and maximum values

CTSR-P/SP10 Series

Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values
shown in “typical” graphs.
On the other hand, measured values are part of a statistical distribution that can be specified by an interval with upper and lower
limits and a probability for measured values to lie within this interval.
Unless otherwise stated (e.g. “100 % tested”), the LEM definition for such intervals designated with “min” and “max” is that theprobability for values of samples to lie in this interval is 99.73 %.
For a normal (Gaussian) distribution, this corresponds to an interval between −3 sigma and +3 sigma. If “typical” values are notobviously mean or average values, those values are defined to delimit intervals with a probability of 68.27 %, corresponding toan interval between -sigma and +sigma for a normal distribution.
Typical, maximal and minimal values are determined during the initial characterization of a product.

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Application information

CTSR-P/SP10 Series

Filtering, decoupling CTSR transducer
Supply voltage UC (5 V):
The CTSR transducers have internal decoupling capacitors, but in the case of a power supply track on the application PCB having
a high impedance, it is advised to provide local decoupling, 100 nF or more, located close to the transducer.

Reference Uref
Ripple present on the Uref pin can be filtered with a low value of capacitance because of the internal 499 ohm series resistance.
The CTSR transducers have an internal capacitor of 22 nF between Uref pin and Gnd pin and the maximum filter capacitance value
which could be added is 1 µF. Adding a larger decoupling capacitor will increase the activation delay of degauss.

Output Uout
The CTSR transducers have an internal low pass filter 470 ohm/22 nF; if a decoupling capacitor is added on Uout pin, the bandwidth
and the response time will be affected. In case of short circuit, the transducer CTSR can source or sink up to a maximum of 10
mA on its output Uout.

Using an external reference voltage
If the Uref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph“Reference Uref”.

I P R M (mA)

600
The Uref pin has two modes Ref out and Ref In:
I P R M point
500 mA• In the Ref out mode the 2.5 V internal precision reference is used by the transducer as the reference
for bipolar
400
measurements; this internal reference is connected to the Uref pin of the transducer through a 499 ohms resistor. It
tolerates sink or source currents up to ±5 mA, but the 499 ohms resistor prevents this current to exceed these limits.
200• In the Ref In mode, an external reference voltage is connected to the Uref pin; this voltage is specified in the range 2.3
to 4 V and is directly used by the transducer as the reference point for
0 measurements. The external reference voltage
Uref must be able:
U − 2.5-200will be 3 mA when Uref = 4 V.
o either to source a typical current of ref, the maximum value499

o or to sink a typical current of-400
2.5 − U ref, the maximum value will be 0.4 mA when Uref = 2.3 V.
499
-600

2 on the external reference
3
4 U
The following graphs show how the measuring range of the transducer depends
voltage value
ref
U
(V)
ref
(UC = 5 V).
600

I P R M 500 mA

200
0
-200
-400
-600

I P R M 850 mA

I P R M (mA)I P R M (mA)

400

1000
800
600
400
200
0
-200
-400
-600
-800
-1000

2

3
Uref (V)4

2

3
Uref (V)4

I P R M (mA)

Upper limit: IP = 500 mA(Uref = 2.3 ... 2.625 V) Upper limit: IP = 850 mA(Uref = 2.3 ... 2.52 V)
1000
Upper limit: IP = −250*Uref + 1156.25(Uref = 2.625 ... 4 V)
Upper limit: IP = −403.88*Uref + 1867.93(Uref = 2.52 ... 4 V)
800
I
850 mA
Lower limit: IP = −250*Uref + 93.75 P R M (Uref = 2.3 ... 2.375 V) Lower limit: IP = −403.88*Uref + 151.45(Uref = 2.3 ... 2.48 V)
600
Lower limit: IP = −500 mA(Uref = 2.375 ... 4 V)
Lower limit: IP = −850 mA		 (Uref = 2.48 ... 4 V)
400
200
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-400
-600
-800
-1000

Primary nominal residual current and primary nominal current

CTSR-P/SP10 Series

The primary nominal residual current is the sum of the instantaneous values of all currents flowing through the aperture of thetransducer.
The primary nominal current is the current flowing through any conductor placed into the aperture of the transducer.
The presence of a primary nominal current DC or AC leads to an additional uncertainty.
For example, with a primary nominal current of 30 A the uncertainty referred to primary is typical 4.3 mA.

Test winding
A test winding is wound around the compensation winding. It allows simulating a primary residual current to test the function of thetransducer. The output voltage Uout referred to Uref for a test current IT is below.
Uout − Uref= SN * IT (test current) * 20
To fullfill the standard IEC 62109-2 with the transducer, the test winding must be used to verify the accuracy of the transducer
according to clause 4.4.4.15.1 and 4.8.3.5 of the IEC 62109-2 before each attempted re-start of the PV inverter.
The current injected in the test winding should be generated by a current source. When the test winding is not used, it must stay
open. A high voltage may be generated by the test winding when a fast transient primary current is applied to the transducer(transformer effect); an additional protection is recommended in application PCB assembly if there is such a possibility.
: Uind at the test winding
di/dt

Uind

CTSR transducer in Test mode
When the Uref pin is forced at a low level voltage between 0 and 1 V and is maintained at this level, the output voltage Uout of CTSR
transducer exhibits a fixed value (see specification) as if it measured a primary test current.
The activation time of test mode is min 30 ms. The CTSR transducer can be maintained in test mode as long as needed forchecking that it is fully operating.

CTSR transducer in Degauss mode
The CTSR transducers go in degauss mode automatically at each power on or on demand by using the Uref pin.
At power on:
A degauss is automatically generated at each power on of the CTSR transducer; during degaussing the output voltage Uout ismaintained at 0.3 V typ. (max 0.5 V). After c.a. 110 ms, the output voltage Uout is released and takes the normal operation level in
relation with the measured primary current.
Using Uref pin:
When the pin Uref is released from the Low level voltage defined in the Test mode above, there is a rising edge on Uref which
generates an automatic degauss.
The activation of degauss takes typically 40 µs after releasing Uref pin, then degauss lasts typically 110 ms.
Uref
2.5 V

Summary of test and degauss modes at Uref = 2.5 V
Test mode

Measuring

Degauss mode

Measuring

1V

Uout referred to Uref
1.7 V (0.3-P) or
1.1 V (0.6-P)

110 ms

0.7 V (0.3-P) or
0.4 V (0.6-P)

Measured I P R

3August2022/Version 8

30 ms

-2 V
-2.5 V

Measured I P R

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Isolation around the CTSR transducer housing

CTSR-P/SP10 Series

Due to the joint between the case and the cover of the CTSR transducer, there is some isolation distance to respect when primaryconductors pass around the CTSR housing. The figure below shows the joint and the apertures where the clearance between thesecondary part inside the CTSR transducer and the surface of the housing is 3 mm (label E).

R
RM

R

UC

R RM

Uref

Uout
PCB footprintR

Assembly on PCB● Recommended PCB hole diameter					Maximum PCB thickness		● Wave soldering profile			No clean process only

1.2 mm for secondary pin
2 mm for retention pin
2.4 mmmaximum 260 °C, 10 s

The two retention pins inserted into the case of the transducer are electrically isolated by the housing. Because one of them isclose to the secondary connector, it is recommended to connect both to the secondary side GND or +Uc.
Consequently any primary conductor must be placed in the PCB at the requested isolation distance regarding these secondarysides (see also paragraph “Isolation around the CTSR transducer housing”).

R
RM

R RM

UC

Uref

R
R

Uout

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CTSR-P/SP10 Series

Dimensions (in mm, general tolerance ±0.3 mm)Connection
out
out

out
in
R
RM

R RM

UC

Uref

RR

M

UC

R

in

Uref

Uout

Uout

in

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