Current Transducer CTSR 1-P

IP R N = 1 A

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

CTSR 0.3-P Black Box
CTSR 0.3-P/SP3 Black Box
CTSR 0.3-P/SP5 Black Box
CTSR 0.6-P Black Box
CTSR 1-P Black Box

Features

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

inverters● Insulated plastic case material recognized according to UL94-V0● First human contact protection of PV arrays● Failure detectionCTSR
in power
sources
1-P_External shape 19.11.2012 TaH● PCB mounting.

● Symmetrical fault detection (e.g. after motor inverter)● Leakage currentレムジャパン株式会社
detection in stacked DCLEM
sources
レムジャパン株式会社
Japan K.K.

Advantages

レムジャパン株式会社

1942-1-2, Nakamachi, Machida,194-0021● Single phase or 〒東京都町田市中町
threephasemeasurement
2-1-2 nominal current
Tokyo 194-0021,
Japan● High accuracy

up to ±30 A per wire (DC or AC).

● Very low offset drift over temperature● Wide aperture (20.1 mm)

Standards● High overload capability● EN 50178: 1997

● High insulation capability● IEC 61010-1: 2010 (safety).

● Reference pin with two modes, Ref In and Ref Out

Application Domain● Degauss and test functions.

● Industrial● Suitable to fulfil VDE 0126-1-1, UL 1741.

N° 74.G9.04.000.0
30May2024/Version 6

Page 1/9
LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

Tel : 042
Fax : 04
URL: httCTSR 1-PSafety⚠

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.
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.
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.

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.
Although LEM applies utmost care to facilitate compliance of end products with applicable regulations during LEM productdesign, use of this part may need additional measures on the application side for compliance with regulations regarding EMC andprotection against electric shock. Therefore LEM cannot be held liable for any potential hazards, damages, injuries or loss of life
resulting from the use of this product.

Underwriters Laboratory Inc. recognized component

Page 2/930May2024/Version 6

LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

CTSR 1-P

Absolute maximum ratings
Parameter

SymbolUnitValueMaximum supply voltage

UC maxV

7Maximum primary conductor temperature

TB max°C

110

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

ÎP max

A

3300

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

UnitValue

V AC/DC600

Max surrounding air temperature

TA°C

105

Primary current

IPA

150

Secondary supply voltage

UCV DC

5Output voltage

Uout

V

0 to 5

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 - CTSR series is intended to be mounted on the printed wiring board of the end-use equipment.
3-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.
4-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 FollowUp Service. Always look for the Mark on the product.

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LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

CTSR 1-P

Insulation coordination
Parameter

Symbol

Unit

Value

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

UdkV

5.4

Impulse withstand voltage 1.2/50 µs

UNikV

10.1

Partial discharge RMS test voltage (qm < 10 pC)

UtkV

1.65

Clearance (pri. - sec.)

dCImm

11Shortest distance throughair

Creepage distance (pri. - sec.)

dCpmm

11Shortest path along device
bodyComparative tracking index

CTI

Application example-Application example

Comment600
V

1000

Basic insulation, non
uniform field according toEN 50178, CAT III PD2

600

Basic insulation, non
uniform field according toEN 50178, IEC 61010, CAT
III PD3-V

SymbolUnitMin

Ambient operating temperature

TA°C−40105

Ambient storage temperature

TA st°C−50105MassmgEnvironmental and mechanical characteristics
Parameter

TypMaxComment28Page 4/930May2024/Version 6

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LEM International SA
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1217 Meyrinwww.lem.com

CTSR 1-P

Electrical data

At TA = 25 °C, UC = +5 V, output voltage referred to Uref, unless otherwise noted (see Min., Max., typical definition paragraph) inpage 6.

Parameter

SymbolUnit

Min

Primary nominal residual RMS current

IP R NA

Primary residual current, measuring range

IP R M

A−1.7

Supply voltage

UCV

4.75

Current consumption

ICOutput voltage referred to GND(during Degauss cycle)

TypCommentMax

1
1.75

5.25mA

17.5

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

UoutV0.30.51)

Output voltage referred to Uref
(Test current)

Uout

V0.0010.350.51)

Reference voltage @ IP = 0Uref

V

2.495

2.52.505

External reference voltage

UE refV

2.3

Electrical offset current
referred to primary 2)

IO E

mA−24

Temperature coefficient of Uref

TCUrefppm/K−50

Temperature coefficient of UO E @ IP = 0

TCUO E

ppm/K−500

Nominal sensitivity

SNV/A

Sensitivity errorεS%−1.6

Temperature coefficient of STCS

ppm/K−200

Linearity error

εL% of IP R M

0.5

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

IO M

mA

57

Output RMS noise voltage (1 Hz … 10 kHz)

Uno

mV

6

RL > 500 kΩ

Delay time to 10 % of the final output value IP N steptD 10µs

7

RL > 500 kΩ,
di/dt > 5 A/µs

Delay time to 90 % of the final output value IP N steptD 90µs

50

RL > 500 kΩ,
di/dt > 5 A/µs

Frequency bandwidth (−1 dB)

BWkHz9.5

RL > 500 kΩ

Error

ε%2)

3)

Notes:

Internal reference of47

Internal reference

Uref input = 499 Ω 1)

2450±50500ppm/K of 2.5 V−40 … 105 °C

1.6

RL > 500 kΩ

200−40 … 105 °C

1.2
0.5

1

1.9= (εS 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
1current”.
23)
Total error @ TA and IP: ε tot (TA ) =  ε 2 + ( TCS6 × 100 × (TA -25))2 + ( TCU6O E × 2.5 × (TA -25 ) / SN × 100 / IP )2 1)2)

1010

Page 5/930May2024/Version 6

LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
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1217 Meyrinwww.lem.com

CTSR 1P
Application information

CTSR 1-P

Application information

Filtering, decoupling CTSR transducer
Filtering, decoupling CTSR transducer
Supply voltage Vc (5 V):
SupplyvoltageUC (5haveV) internal decoupling capacitors, but in the case of a power supply track on the application PCB
The CTSRtransducers

havinghigh impedance,
is advised
to provide
local decoupling,more, supply
locatedtrack
closeontothe
theapplicationtransducer.PCB having
TheCTSRa transducers
have itinternal
decoupling
capacitors,
but in the 100
casenFof or
a powera high impedance, it is advised to provide local decoupling, 100 nF or more, located close to the transducer.

Reference Vref:Reference
Urefon the V
Ripple present

The CTSR
an beinternal
capacitorof 22
nF between
V
Ripplepresenttransducers
on the Uref havepin canfilteredwith a lowvalueof capacitancebecause of the internal 499 ohm series resistance.
value
whichcould
beadded
is1µF.
Addingalarger
decoupling
capacitor
willGndincrease
thetheactivation
delaydegauss. value
The CTSR transducers have an internal capacitor of 22 nF between Uref pin andpin andmaximum
filterofcapacitancewhich could be added is 1 µF. Adding a larger decoupling capacitor will increase the activation delay of degauss.

Output Vout:
Output Uout

Vout pin, theThe
CTSR transducers
have antimeinternalpass filterIn470
ohm/22nF;circuit,
if a decoupling
capacitoris added
on Uoutorpin,
theupbandwidth
bandwidth
and the response
will low
be affected.
caseof shortthe transducer
CTSR
can source
sinkto aandthe response
timeonwillitsbe
affected.
maximumof 10 mA
outputVout.In case of short circuit, the transducer CTSR can source or sink up to a maximum of 10mA on its output Uout.

Using an external reference voltage
Using an external reference voltage

If the V
If theUref pin of
the transducer is not used it could be either left unconnected or filtered according to the previous paragraph“ReferenceVref”.
“Reference Uref”.
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 bipolar
The Uref pin has two modes Ref out and Ref In:
measurements; this internal reference is connected to the Vref pin of the transducer through a 499 ohms resistor. It• In the Ref out mode the 2.5 V internal precision reference is used by the transducer as the reference point for bipolar
tolerates sink or source currents up to ±5 mA, but the 499 ohms resistor prevents this current to exceed these limits.
measurements; this internal reference is connected to the Uref pin of the transducer through a 499 ohms resistor. It• In the Ref In mode, an external reference voltage is connectedto the V
tolerates sink or source currents up to ±5 mA, but the 499 ohms resistor prevents this current to exceed these limits.
to 4 V and is directly used by the transducer as the reference point for measurements. The external reference voltage• In the Ref In mode, an external reference voltage is connected to the Uref pin; this voltage is specified in the range 2.3
Vref must be able:
to 4 V and is directly used by the transducer
as the reference point for measurements. The external reference voltage
o either to source a typical current of Vref − 2.5 , the maximum value will be 3 mA when Vref = 4 V.
Uref must be able:499
o either to source a typical current of U ref − 2.5 , the maximum value will be 3 mA when Uref = 4 V.
o or to sink a typical current of 2.5 − Vref499, the maximum value will be 0.4 mA when Vref = 2.3 V.
o or to sink a typical current of 2.5 −499

U ref499, the maximum value will be 0.4 mA when Uref = 2.3 V.

The
followinggraphs
graphsshow
showhowhowthethemeasuring
measuring range
range ofof thevoltage
value
Vref
The
following
the transducer
transducer depends
dependson
onthetheexternal
externalreference
referencevoltage
value
Uref
5 V).
(U(Vc= 5= V).
C2000

IP R M 1700 mA

1500
I P R M (mA)

1000500
0-500-1000-1500-2000
23V REF (V)Upper=1700
mA
Upper
limit:limit:
IP = I1700
mA		P
Upperlimit:
I=-833.3*Vref+3854.2
Upper limit: IP = −833.3* Uref + 3854.2
PLower=-833.3*Vref+312.5
Lower
limit:limit:
IP = I−833.3* Uref + 312.5
PLower=-1700mA
Lower
limit:limit:
IP = I−1700
mA		
P

4

2.3..2.625(Uref(Vref= 2.3= …
2.625 V)V)
(Vref=2.625..4(Uref = 2.625 … 4 V)V)
2.3..2.375(Uref(Vref= 2.3= …
2.375 V)V)
(Vref=2.375..4(Uref = 2.375 … 4 V)V)

30May2024/Version 6

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28Mar2012 / Version 2

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LEM International SA
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1217 Meyrinwww.lem.com

CTSR 1-P
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 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 for checking 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.
dCp
dCl
Insulation 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).

nUCUrefUoutPage 7/930May2024/Version 6

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CTSR 1-P
PCB footprint

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

1.2 mm for secondary pind2 mm ford retention pin
2.4 mmmaximum 260 °C, 10 sClCpThe two retention pins inserted into the case of the transducer are electriclly insulated 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.
Connection
Consequently any primaryconductor must be placed in the PCB at the requested isolation distance regarding these secondarysides (see also paragraph “Isolation around the CTSR transducer housing”).
UCUrefUoutPage 8/930May2024/Version 6LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com

CTSR 1-PDimensions (in mm, general tolerance ±0.3 mm)

dCl

Connection
UC

Uref
Uout

dCl

dCp

Connection
UC

Uref
Uout
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LEM reserves the right to carry out modifications on its transducers,in order to improve them.

LEM International SA
Route du Nant-d’Avril, 152
1217 Meyrinwww.lem.com