Current Transducer CTSR 0.3-TP/SP4

IPRN = 300 mA

For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between
the primary circuit and the secondary circuit.

FeaturesApplications●● Closed loop (compensated) current transducer●● Residual current measurement●● Voltage output●● Leakage current measurement in transformerless PV●● Single supply voltage

inverters●● PCB mounting●● First human contact protection of PV arrays●● Four integrated primary conductors.

●● Failure detection in power sources

Special feature●● Symmetrical fault detection (e.g. after motor inverter)●● No retention pin.

●● Single phase or three phase nominal current measurement●● Leakage current detection in stacked DC sources

Advantages

up to ± 30 A per wire (DC or AC).

●● High accuracyStandards●● Very low offset drift over temperature●● EN 50178: 1997●● High overload capability●● IEC 61010-1: 2010●● High insulation capability●● Reference pin with two modes, Ref In and Ref Out●● UL 508: 2010.

●● Degauss and test functions

Application Domain●● Possibility to add up to four primary wires (diam. 4.2 mm●● Industrialmax) in addition to the already integrated primary conductors. ●● Suitable to fulfil VDE 0126-1-1 and UL 1741.

N°97.H3.A2.004.0
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CTSR 0.3-TP/SP4
Absolute maximum ratings
Parameter

Symbol

Unit

Value

Supply voltage

UCV7

Primary conductor temperature

TB°C

110

Overload capability (100 µs, 500 A/µs)

ÎPA3300

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

Value Version TP

V AC/DC

600

1000

Max surrounding air temperatureTA°C105

Primary currentIPA

According to series primary currents

Secondary supply voltage

UCV DC

7

Output voltage

Vout

V0 to 7

* Enviromental: For use in Pollution degree 3.
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.
2-T he insulation between the primary and the secondary sensing circuits were evaluated with 4250 V AC for CTSR 0.6-TP/
SP and 2200 V AC for CTSR 0.6-P in dielectric voltage withstand test.
5 - CTSR series is intended to be mounted on the printed wiring board of the end-use equipment.
7-T he 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-P rimary 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 0.3-TP/SP4
Insulation coordination
Parameter

Symbol

Unit

Value

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

UdkV

6

Impulse withstand voltage 1.2/50 µs

ÛWkV

11.2

Partial discharge extinction rms voltage @ 10 pC

UekV

2.475

Clearance (pri. - pri.)

dCImm

6.7

Shortest distance throughairCreepage distance (pri. - pri.)

dCpmm

6.7

Shortest path along device
body

Clearance (pri. - sec.)

dCImm

13.5

Shortest distance throughair

Creepage distance (pri. - sec.)

dCpmm

33.2

Shortest path along device
body

Comment

When mounted on a PCB (with recommended hole and pad diameters, see paragraph “PCB footprint”).
Clearance (pri. - pri.)

dCImm

5.6

Shortest distance throughair

Creepage distance (pri. - pri.)

dCpmm

5.6

Shortest path along device
body

Clearance (pri. - sec.)

dCImm

12.5

Shortest distance throughair

Creepage distance (pri. - sec.)

dCpmm

12.5

Shortest path along devicebody

Comparative tracking index

CTIV

600

Application example

-V

1000

Reinforced insulation, CATIII, PD2 non uniform fieldaccording to EN 50178

1500

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

Application example-V

SymbolUnit

Min

Ambient operating temperature

TA°C

-40

105

Ambient storage temperature

TS°C

-50

105

MassmgEnvironmental and mechanical characteristics
Parameter

TypMaxComment55

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CTSR 0.3-TP/SP4
Electrical data
At TA = 25 °C, UC = + 5 V, output voltage referred to Vref, unless otherwise noted (see Min., Max., typical definition paragraph) inpage 9.

Parameter

SymbolUnit

Min

Primary nominal residual rms current

IPRN

mA

Primary residual current, measuring range

IPRM

mA

-500

Supply voltage

UCV

4.75

Current consumption

ICOutput voltage referred to GND(during Degauss cycle)

TypMaxComment

300
500
55.25mA

17.5

21.6+ IP (mA)/NSWith NS = 1000 turns- 40 .. 105 °C

VoutV

0.30.5Note 1)

Output voltage referred to Vref
(Test current)

VoutV

0.7

1.2

1.7

Note 1)

Reference voltage @ IP = 0Vref

V

2.495

2.5

2.505

External reference voltage

VrefV

2.3

Electrical offset current
referred to primary (Note 2))

IOE

mA

-24

Temperature coefficient of Vref

TCVrefppm/K±50- 40 .. 105 °C

Temperature coefficient of VOE @ IP = 0TCVOE

ppm/K±570

ppm/K of 2.5 V- 40 .. 105 °C

GthV/A

Sensitivity error (Note )

εG%

1.6

RL > 500 kΩTemperature coefficient of G

TCG

ppm/K±230- 40 .. 85 °C±400- 40 .. 105 °C

Linearity error

εL% of IPRM

0.5

Magnetic offset current (1000 x IPRN)
referred to primary

IOM

mA

17

Output rms noise voltage (1 Hz .. 10 kHz)

VnomV

6

RL > 500 kΩ

Reaction time @ 10 % of IPRN

traµs

7

RL > 500 kΩ,
di/dt > 5 A/µs

Step response time to 90 % of IPN

trµs

50

RL > 500 kΩ,
di/dt > 5 A/µs

Frequency bandwidth (- 1 dB)

BWkHz

3.5

RL > 500 kΩ

Accuracy (Note )X%Internal reference
Internal reference ofTheoretical sensitivity2)

3)

Notes:47

Vref input = 499 ΩNote 1)

24

4-1.6

0.5

1

1.9= (εG 2 + εL 2)1/2

See “Application information” section.
Only with a primary nominal residual current, see paragraph “Primary nominal residual current and primary nominal		 current”.
3)
Accuracy @ TA and IP: XTA = (X2 + (TCG•100•(TA - 25))2 + (TCVOE•2.5•(TA - 25 )/Gth•100/ IP )2)1/2.
1)
2)

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CTSR 0.3-TP/SP4

Phase (°)

Relative sensitivity (dB)

Typical performance characteristics

Frequency (Hz)Vno (V)eno (dBVrms/rtHz)

Figure 1: Frequency response

Figure 2: Output noise voltage spectral density

Figure 3: Output noise, cumulated rms

Figure 4: Typical step response

Figure 5: Typical step response

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CTSR 0.3-TP/SP4

Application information
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 Vref
Ripple present on the Vref 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 Vref 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 Vout
The CTSR transducers have an internal low pass filter 470 ohm/22 nF; if a decoupling capacitor is added on Vout 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 10mA on its output Vout.

Using an external reference voltage
If the Vref pin of the transducer is not used it could be either left unconnected or filtered according to the previous paragraph“Reference Vref”.
The Vref pin has two modes Ref out and Ref In:• In the Ref out mode the 2.5 V internal precision reference is used by the transducer as the reference point for bipolarmeasurements; this internal reference is connected to the Vref 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.
• In the Ref In mode, an external reference voltage is connected to the Vref 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 measurements. The external reference voltage
Vref must be able:
Vref − 2.5
oo either to source a typical current of, the maximum value will be 3 mA when Vref = 4 V.
499

oo or to sink a typical current of 2.5 − Vref , the maximum value will be 0.4 mA when Vref = 2.3 V.
499

I PRM (mA)

The following graphs show how the measuring range of the transducer depends on the external reference voltage value Vref
(Uc = 5 V).
600
IPRM 500 mA
400
200
0-200
-400

28January2014/version 7I PRM (mA)

-600

23Vref (V)41000
800 limit: IP= 500 mA		IPRM 850 mA(Vref = 2.3 .. 2.625 V)
Upper
Upper
(Vref = 2.625 .. 4 V)
600 limit: IP= -250*Vref+ 1156.25
Lower(Vref = 2.3 .. 2.375 V)
400 limit: IP=- 250*Vref+ 93.75
Lowerlimit:
I=-500mA		
(Vref = 2.375 .. 4 V)
200
P

0-200
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CTSR 0.3-TP/SP4
Primary nominal residual current and primary nominal current
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.

CTSR transducer in Test mode
When the Vref pin is forced at a low level voltage between 0 and 1 V and is maintained at this level, the output voltage Vout 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 Vref pin.
At power on:
A degauss is automatically generated at each power on of the CTSR transducer; during degaussing the output voltage Vout ismaintained at 0.3 V typ. (max 0.5 V). After c.a. 110 ms, the output voltage Vout is released and takes the normal operation level in
relation with the measured primary current.
Using Vref pin:
When the pin Vref is released from the Low level voltage defined in the Test mode above, there is a rising edge on Vref which
generates an automatic degauss. The activation of degauss takes typically 40 µs after releasing Vref pin, then degauss lasts
typically 110 ms.
Summary of test and degauss modes at Vref = 2.5 VVref
2.5 V

Test mode

Measuring

Degauss mode

Measuring

1VVou t referred to Vref
1.7 V

110 ms

0.7 V

Measured IPR

30 ms-2 V-2.5 V

Measured IPR

Isolation around the CTSR transducer housing
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 the secondary part inside the CTSR transducer
and the surface of the housing is 3 mm (label E).

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CTSR 0.3-TP/SP4
Integrated primary conductors

The four integrated primary conductors have a diameter of 2.5 mm. The three conductors 5-10, 6-9 and 7-8 could be used as thelines in a three phase system; the conductor 11-12 could be used either as the neutral in a three phase system or as a test current
conductor.
Primary conductor

Typical primary conductor resistance RP (mOhm)

5-10, 7-8

0.32

6-9

0.36

11-12

0.26

The maximum primary current per conductor must comply with the primary conductor temperature specified in paragraph “Absolutemaximum ratings”.

PCB footprint

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CTSR 0.3-TP/SP4
Assembly on PCB●● Recommended PCB hole diameter					Maximum PCB thickness		●● Wave soldering profile			No clean process only

1.2 mm for secondary pin
2.9 mm for primary pin
2.4 mmmaximum 260 °C, 10 s

Any primary conductor must be placed in the pCB at the requested insulation distance regarding the secondary side (see also
paragraph “Insulation around the CTSR transducer housing”).

Definition of typical, minimum and maximum values
Minimum and maximum values for specified limiting and safety conditions have to be understood as such as well as values shownin “typical” graphs. On the other hand, measured values are part of a statistical distribution that can be specified by an interval withupper 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 aninterval between -3 sigma and +3 sigma.
If “typical” values are not obviously mean or average values, those values are defined to delimit intervals with a probability of 68.27%, corresponding to an interval between -sigma and +sigma for a normal distribution.
Typical, maximal and minimal values are determined during the initial characterization of a product.

SafetyThis transducer must be used in limited-energy secondary circuits according to IEC 61010-1.

This transducer must be used in electric/electronic equipment with respect to applicable standards and safety requirements inaccordance with the manufacturer’s operating instructions.

Caution, risk of electrical shock
When operating the transducer, certain parts of the module can carry hazardous voltage (eg. primary busbar, power supply).
Ignoring this warning can lead to injury and/or cause serious damage.
This transducer is a build-in device, whose conducting parts must be inaccessible after installation.
A protective housing or additional shield could be used.
Main supply must be able to be disconnected.

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CTSR 0.3-TP/SP4
Dimensions (in mm, general tolerance ± 0.3 mm)Connection
outUC
RM

Vref
VoutinPage 10/10

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