DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DCDT series: Automotive Residual Current Monitoring type B sensors
DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4
Product description:
The DCDT series is the LEM RCM type B current sensor family designed to measure and protect fromAC and DC fault current (leakage current), dedicated to automotive applications. Our proprietary fluxgate
architecture allows the sensor to have best in class accuracy hence protection from potential fire hazards
and electrical shocks. The package is configurable up to 4 conductors 48Arms capable, allowing 1 and 3phases systems and offering an optimized leakage measurement of configurations by design.
The DCDT series sensors provide a tripping fault current output and an SPI bus enabling fast responsetime and detailed fault information. For automotive applications, such as bidirectional On-Board
Chargers, an ISO26262 ASIL B compliant version offers additional safety diagnostics.
Additionally, DCDT is integrating a current transformer (second sensor) for high frequency AC leakage
compensation (measurement and injection capable) up to 100kHz.

Measurement principle:
In a stable system the sum of current (phase and neutral) flowing in conductors is null, when a fault
occurs, a difference is measured between phase and neutral conductors. This difference represents theleakage current typically caused by a loss of insulation from a conductor to the earth.
Main Features & Advantages

Typical applications• Automotive qualified (AEC-Q100 and 200
components)• Up to 48 A RMS current per primary conductor• Primary current measurement range: ±300 mA DC• External test via dedicated pin• SPI and digital tripping outputs• Compact design for PCB mounting• Excellent accuracy• Fast Tripping• Reinforced galvanic insulation.
• AC leakage reinjection up to 100kHz

Developed for, EV On Board Charger:• Automotive OBC up to 22 kW (V2L, V2G, V2H)
Compatible with, Off board Charging:• Mode 2: In Cord – Control and Protection Device(IC-CPD)• Mode 3: Wall box chargers

Functional safety (SF version only)• ISO26262 ASIL B: refer to safety manual.

EMC Compatible standards: *• IEC 61851-21: 2017

Fault current tripping according to: *• IEC 62752: 2016 and UL 2231: 2012
*Complete list of reference standards available in safety
manualFigure 1: DCDT-SF 0.3-S2
DCDT 0.3-S2

Figure 2: DCDT-SF 0.3-S4
DCDT 0.3-S4

Page 1 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Sensor Selection Table
The following table summarizes the configuration of the product:
Item Number

HF Sensing
100 kHz (Y/N)

Safety Capable
Sensor (Y/N)

Number of Primary
Conductors

Primary
Conductor 1
Pin 13/17

DCDT 0.3-S2

90.W4.A2.2xx.0*

N

N1

2

MountedMounted

DCDT-SF 0.3-S2

90.W6.A2.2xx.0*

N

Y1

2

MountedMounted4

MountedMountedMountedMounted4

MountedMountedMountedMountedReference

DCDT 0.3-S4

90.W4.A2.4xx.0*

N

N1

DCDT-SF 0.3-S4

90.W6.A2.4xx.0*

N

Y1

Primary
Conductor 2
Pin 14/18

Primary
Conductor 3
Pin 15/19

Primary
Conductor 4
Pin 16/20

1) The SPI Interface is not required, the fault current tripping signal is available via the dedicated tripping pin, seeSensor Pin Out. SPI is only required for ASIL B ISO26262 metrics compliance.

Tripping configurations of the transducer:
Typ. Tripping threshold

Typ. Recovery Level(mA @ 50 Hz or 60 Hz)(mA @ 50 Hz or 60 Hz)

AC

22.2

16.6

/ 6 mA DC

DC

4.4

3.3

IEC62752

AC

15

11.25

DC

4.4

3.3

Applicable Standard

IEC62752I∆n = 30 mA AC RMS

I∆n = 20 mA RMS/ 6 mA DC

LEM tripping
referencexx itemnumberxCDT-IEC30m

00

xCDT-IEC20m

01xCDT-IEC6m

04

xCDT-UL20m

05

xCDT-UL5m

06

Below tripping configuration available upon request and qualification.
IEC62752

AC

4.5

3.37

/ 6 mA DC

DC

4.4

3.3

UL2231

AC

16.8

12.6

CCID20 (I∆n = 20 mA RMS)

DC

4.4

3.3

UL2231

AC

5

3.75

CCID5 (I∆n = 5 mA RMS)

DC

4.4

3.3

I∆n = 6 mA RMS

For customer system development support.

07

Single time tripping level selection via SPI from the following: xCDT-IEC30m, xCDT-IEC20m, xCDT-UL20m.

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Sensor Pin Out (TOP VIEW)
Pin
n°

17

20
16

13

15
14

19

18

11 12 1 2 3 4 5 6 7 8 9 10Signal TypeType

Signal Name

Description

1

Digital (SPI) 1)

Input

SCLK

SPI Clock2

Digital (SPI) 1)

Input

MOSI

SPI Master Output Slave Input

3

Digital (SPI) 1)

OutputMISO

SPI Master Input Slave Output

4

Digital (SPI) 1)

OutputSS

SPI Slave Select5

Digital 1)

OutputTRIP

Tripping Signal

6Power supply (0V)

0V

Negative power supply rail

7

Power supply (5V)

VCC

Positive power supply rail

8

AnalogInput

LF_ITST_IN

LF test winding current input

9

AnalogOutput

HF_ITST_OUT

HF test winding current output

10

AnalogInput

HF_ITST_IN

HF test winding current input

11

AnalogOutput

HF_MES_OUT

HF measurement current output

12

AnalogInput

HF_MES_IN

HF measurement current input

13

Phase 1 Input

I1_IN

Primary Conductor 1 input current

14

Phase 2 Input

I2_IN

Primary Conductor 2 input current*

15

Phase 3 Input

I3_IN

Primary Conductor 3 input current

16

Phase 4 Input

I4_IN

Primary Conductor 4 input current*

17

Phase 1 Output

I1_OUT

Primary Conductor 1 output current

18

Phase 2 Output

I2_OUT

Primary Conductor 2 output current*

19

Phase 3 Output

I3_OUT

Primary Conductor 3 output current

20

Phase 4 Output

I4_OUT

Primary Conductor 4 output current*

1): Please refer to chapter: SPI and Tripping Pin characteristics (Digital)

Sensor Internal Architecture

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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Sensor Magnetic Structure

Absolute maximum ratings 2) 3)
Parameter

Symbol

Unit

Value

Maximum primary conductor temperature

TB max°C

150 °C (for short term period) 1)

Primary peak current per primary conductor

ÎP maxA

125

UESD HBM

kV

2

UC

V

6

Electrostatic discharge voltage(HBM – Human Body Model)
Supply voltage

Notes:
1) The design of customer PCB tracks (width & thickness) and the LEM transducer’s primary jumpers can influence eachother regarding thermal exchanges and self-heating. Customer remains responsible for thermal design.
2) Absolute maximum ratings apply at 25 °C unless otherwise noted.
3) Exposure to absolute maximum ratings for extended periods of time may affect reliability.

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

General electrical ratings
Parameter

SymbolUnit

Primary nominal AC RMS voltage (continuous)

UP N ACV

Primary current

IP N AC

A

RP

uΩ

166

FIT

428 3)

Resistance of any primary conductor
Base FIT of xCDT-SF 0.3-Sx

Notes:Min

TypicalMax

Comment

400
40 1)
48 2)

Under qualification tests@ 25 °C

1) Tripping variants xCDT-IEC6m xCDT-UL5m
2)

Tripping variants xCDT-IEC30m xCDT-IEC20m xCDT-UL20m

3) This value is calculated using IEC 62380 Standard and sensor ambient temperature profile of 73 °C. It is a FIT

value with no safety mechanism applied. ISO 26262 PMHF is lower and compatible with ASIL-B metrics.

Insulation coordination
SymbolUnit

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

Parameter

Ud

kV

TBD

According to IEC60664-1

Primary/Secondary RMS voltage for AC insulation test, 50 Hz, 1 min

Ud

kV

TBD

According to IEC60664-1

Primary/Primary Impulse withstand voltage 1.2/50 μs

UNi

kV

TBD

According to IEC60664-1

Primary/Secondary Impulse withstand voltage 1.2/50 μs

UNi

kV

TBD

According to IEC60664-1

Primary/Primary Insulation Resistance

RINS

MΩ

TBD

According to IEC62752

Primary/Secondary Insulation Resistance

RINS

MΩ

TBD

According to IEC62752

Clearance (primary to primary) variant S2 & S4

dCI

mm

3.1

Shortest distance through air

Creepage distance (primary to primary) variant S4

dCp

mm

3.1

Shortest path along device body

Creepage distance (primary to primary) variant S2

dCp

mm

4

Shortest path along device body

Clearance (primary to secondary) variant S2 & S4

dCI

mm

9.6

Shortest distance through air

Creepage distance (primary to secondary) variant S2 & S4

dCp

mm

9.6

Shortest path along device body

Case material

-

-

V0

According to UL 94

Comparative tracking index

CTI

Value

Comment

600

Fluxgate RCM sensor performances
Environmental and mechanical characteristics
Parameter

SymbolRecommended ambient operating temperature(sensor external T°C)

TA

Operating temperature (sensor internal PCBA T°C)

TA

Unit

Min

TypicalMax

Comment
Customer cooling
related 1)

°C

−40

105

°C

−40

120

−40

125

Ambient storage and transportation temperature

TA st

°C

Relative humidity

RH%

Software temperaturefault protection at
120°C
Sensor not connected.
(no power supply)

501) Sensor cooling is impacted by customer PCBA design. Adequate secondary routing (GND plane) may offer

Notes:
thermal improvement.

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1217 Meyrinwww.lem.com

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

General electrical ratings 1)
Parameter

SymbolUnit

Min

TypicalDC primary residual current, measuring range

IP R M DC

mA

−300

300

AC RMS primary residual current, measuring range

IP R M AC

mA

0

200

Supply voltage

UC

V

4.75

Supply voltage rise rate

SVCC

V/ms

0.03

5

Current consumption - Operating Mode

IC

mA

70

Start-up time

tstart

ms

800

1)

Max

Comment

5.25

100

47 uF filtering
capacitor requiredon sensor 5V
supply.
Over full temperatureand supply voltage
range

Low voltage circuits are intended to be powered by a circuit derived from an isolating source (such as a transformer,
optical isolator, limiting impedance or electro-mechanical relay) and having no direct connection back to the primarycircuit (other than through the grounding means).

Primary referred measurement performances of SPI outputs
Parameter

SymbolUnit

Frequency bandwidth (−3 dB)

BW

kHz

Total error CH1 referred to primary IP R:−8.6 mA < IP R DC < 8.6 mA

εtot

mA

Total error CH1 referred to primary IP R:−300 mA < IP R DC < −8.6 mA and
8.6 mA < IP R DC < 300 mA

εtot

mA

Total error CH2 referred to primary IP R:−8.4 mA < IP R DC < 8.4 mA

εtot

mA

εtot

mA

RR

dB

Total error CH2 referred to primary IP R:−300 mA < IP R DC < −5.3 mA and
5.3 mA < IP R DC < 300 mA
50Hz mode rejection ratio

Min

TypicalMax

Comment

2
−1.3

1.3

Evaluated on 200 samples/400 ms±15 % IP R DC

Evaluated on 200 samples/400 ms.

−1.6

1.6

xCDT-SF version only

xCDT-SF version only

±19 % IP R DC
-200

-73

Test winding characteristics
Parameter

SymbolUnit

Min

TypicalMax

Comment@ UC Typical

Test winding peak voltage

ÛT

V

−10

10

DC test winding current range

IT DC

mA

−18.7518.75

AC RMS test winding current range

IT AC

mA

0

12.5

Turn ratio

NP/NS

Resistance of test winding (at 2 kHz)

RT

1:16
Ω

3

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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

SPI and Tripping Pin characteristics (Digital)
Parameter

SymbolUnit

Min

TypicalMax

Comment
Isource=3mA / Isource=9mA.

Output logic highOutput logic low

V

3.0/2.6

3.3

3.34

V

0

0

0.3/0.7

V

2.7

3.43

V

0

0.6

It is recommended to set a line
resistor on SPI MISO to limit
current due to 3V3
imbalance. See applicationnote.
Isink=3mA / Isink=9mA.
It is recommended to set a line
resistor on SPI SS, CLK and MOSI
to limit current due to 3V3
imbalance. See application
note.

Input logic highInput logic low
Sink / source output maximum current

Iout max

mA

−15

+15

Input low injection current (in protection diod)

IICL

mA

0

-5

Input high injection current (in protection diod)

IICH

mA

0

+5

Input Voltage > 3V3+0.3+20

Absolute instantaneous sum of
all ± input injection currents
from all I/O pins.

Total Input Injection Current (sum of all I/O
and control pins)
Sensitivity of channel 1 and 2 (SPI)Σ ILICTmA

SN

LSB/mA

10mA/LSB

0.1

Resolution of channel 1 and 2 (SPI)-20

Input Voltage < 0V-0.3

SPI and tripping switching characteristics 1)
Parameter

SymbolUnit

Min

Clock input low or high timetSPI 1ns

15

Data output valid after clock edgetSPI 2ns

Setup time of input data to clock edgetSPI 3ns

10

Hold time of input data to clock edgetSPI 4

ns

15

Slave Select falling edge to clock edgetSPI 5ns

4000

Slave Select rising edge to Output high impedancetSPI 6ns

8

Slave Select rising edge after clock edgetSPI 7ns

TBD

TypicalMax

Comment

20

Value imposed by SW design choice.
50

Notes: 1) Refer to SPI specification document for protocol details. SW implementation supports a SPI clock at 1 MHz+/- 10 KHz.

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Current transformer performances
Measurement output characteristics (high frequency sensing element)
Parameter
Measurement winding peak voltage
AC RMS primary residual current, measuring range
Output current of measurement winding
Turn ratio

Symbol

Unit

ÛS

V

Min

TypicalMax

Comment

TBD

IP R M AC

mA

0

200

Iout

mA

0

2.5

NP/NS

1:80

Resistance of secondary winding

RS

Ω

2

Measuring Resistance

RM

Ω

TBD

Inductance of measurement winding (primary open)LS

mH@ 20 kHz@ TBD Hz and
TBD mA

TBD

Primary referred measurement performances (high frequency sensing element)
SymbolUnit

Min

Frequency bandwidth (−3 dB)

Parameter

BW

Hz

47

Total error referred at primary IP R: IP R AC < 3 mA

εtot

mA

Total error referred at primary IP R: 3 mA < IP R AC < 200 mA

εtot

%

TypicalMax

Comment

100k
1@ TBD Hz

±5 % IP R AC

@ TBD Hz

Test/Injection winding input characteristics (high frequency sensing element)
Parameter

Symbol

Unit

Min

mA

0

mA

0

TypicalÛS

Test winding peak voltage
AC RMS Test current range referred to primary
AC test current range

IT

Resistance of test winding

RT

Comment

TBD

NP/NS

Turn ratio

Max

200
2.5
1:80

Ω

2

@ 20 kHzPrimary referred Test/Injection winding input performances (high frequency sensing
element)
SymbolUnit

Min

Frequency bandwidth (−3 dB)

Parameter

BW

Hz

47

Total error referred at primary IP R: IP R AC < 3 mA

εtot

Total error referred at primary IP R: 3 mA < IP R AC < 200 mA

εtot

Typical

mA

%

Max

Comment

100k

1±5 % IP R AC

@TBD Hz with
one of the
primary
conductors
short- circuited@TBD Hz with
one of the
primary
conductors
short- circuited

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Performance Parameters Definition
Definition of typical, minimum and maximum values
Minimum and maximum values for specified limiting and safety conditions must 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 upperand 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” isthat the probability 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 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 the product.

Sensor Application Notes
xCDT sensor Application note reference PDM number includes information that will ensure robust integration of the sensor
in customer application (test set-up, magnetic environment...).
SPI Technical Specification reference PDM number detail the Serial Peripheral Interface protocol to be implemented by
the customer to communicate with the sensor.
The latest version of these documents can be downloaded from LEM Website.

Correct Sensor Integration inside Power Converters regarding EMC constraints
The differential transducer placement inside client application, typically in a car onboard charger, must be chosen tominimize EMC interferences. It shall be located after surge absorbers at position 4 to 5.
Other positioning may degrade the performance of the sensor.
The sensor is sensitive to aliasing phenomena on high frequency content (>10 kHz) which shall be minimized on thecustomer side.

Test Winding Low Frequency Sensing Element Design rules
Customer test winding driving circuit for low frequency sensor element must be designed carefully to avoid interactions
with the sensor. It must behave as a perfect current source while injecting current and shall be floating while unused.

Page 9 of 21

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Test/Injection Winding High Frequency Sensing Element Design rules
Customer test/injection winding customer driving circuit for high frequency sensor element must be designed carefully to
avoid interactions with the sensor. It must behave as a perfect current source while injecting current and shall be floating
while unused.

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Sensor typical interface
See Application Note for details on values of components.

Tripping Pin and SPI TRIP Signal
The tripping pin and SPI TRIP signal are used to indicate that a fault current has been detected. In such condition,
the pin goes to LOW and the SPI signal goes to high whether AC or DC tripping occurred, or in a situation when
the sensor is not operational. During startup, the TRIP pin is set-up in high impedance and requires a pull-downresistor for safe operation.
Please refer to the safety manual for detailed description of “safe state” according to ISO26262.

Tripping timing diagram
The tripping signal will operate as follows:

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LEM International SA
Route du Nant-d’Avril, 152
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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4
Note: The typical over-current recovery delay is 5ms.
The Fault tripping time of LEM sensor only includes the delay related to the measurement of leakage current but does
not comprise additional delay related to customer electronic circuit (control circuit of relay, relay opening time...).
On following graphs, the red dashed curve shows the tripping characteristic required by the norm and the blue curve
gives you the theorical tripping time programmed in the sensor software. To consider measurement tolerance, customer
can include a maximum LEM actual tripping time variation of +/- 30 % compared to theorical blue curve on short trippingtime.
Overcurrent specifications: For a primary peak current (IP R M) above |300|mA the typical tripping time is 500us.

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Route du Nant-d’Avril, 152
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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DC Tripping

AC Tripping

Current(mA DC)

Tripping
Time (ms)Current(mA
RMS)

Tripping
Time (ms)

6

715

30

76.0

20

130

70

23.0

30

70.0

100

15.0

100

13.0

200

6.99

200

6.99

300

5.00

DC Tripping
Current(mA DC)AC Tripping

Tripping
Time (ms)Current(mA
RMS)

Tripping
Time (ms)

6

715

20

77.0

20

73.0

30

38.0

30

35.0

70

15.0

100

9.01

100

9.01

200

5.01

200

6.01

300

3.99

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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DC Tripping
Current(mA DC)

Tripping
Time (ms)AC Tripping
Current(mA
RMS)

Tripping
Time (ms)
78

6

82

6

20

13.0

20

15

30

9.00

30

9.00

100

2.99

70

5.01

200

2.00

100

4.00

300

1.99

200

3.00

DC Tripping

AC Tripping

Current(mA DC)

Tripping
Time (ms)Current(mA
RMS)

Tripping
Time (ms)

6

700

20

180

20

129

30

77.1

30

75.0

70

26.0

100

16.1

100

17.0

200

7.95

200

8.00

300

5.99

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LEM International SA
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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DC Tripping
Current(mA DC)

Tripping
Time (ms)AC Tripping
Current(mA
RMS)

Tripping
Time (ms)
700

6

182

5

20

56.1

20

116

30

36.1

30

67.0

100

11.0

70

26.0

200

6.02

100

18.2

300

3.98

200

6.04

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Route du Nant-d’Avril, 152
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DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

The absolute error of the sensor measurement channels versus voltage supply is given as follows (data extract DV test
results 01/2023):

Page 16 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Dimensions DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4 (in mm)

Page 17 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DCDT-SF xxx-S2

Page 18 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

DCDT-SF xxx-S4

Page 19 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Mechanical characteristics
•
•

•
•
•
•
•
•
•

Plastic case
Mass
- CDT-SF 0.3-S2- CDT-SF 0.3-S4
Primary conductor material
Electrical terminal coating
Degrees of protection provided by enclosure
Connector type
Soldering type
Soldering profile
Recommended PCB thickness

Mandatory screws for the 2 fixing holes

PA66-GF25
33 g
41 g
EN CW004A Cu-etp
Nickel + Matte Tin Plating
IP40
Through Hole
Wave or selective wave
Maximum TBD °C, 10 s
1.6 mmDELTA PT Ø 2.5 x 8 mm
INOX A2 or equivalent non-magnetic steel
Fastening torque = 0.6 ±0.1 N·m.

Assembly recommendations
When installed in the end-use equipment, consideration shall be given to the following:
The sensor shall be assembled in industrials ESD protected environment.
These devices are intended to be mounted on the printed wiring board of the end-use equipment.

Page 20 of 21

G20001ASDA/Version 1.19

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

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

DCDT 0.3-S2, DCDT-SF 0.3-S2, DCDT 0.3-S4, DCDT-SF 0.3-S4

Safety⚠

CautionIf the device is used in a way that is not specified by the manufacturer, the protection provided by the device may becompromised.
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/electronicequipment with 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 andhigh currents (e.g., power supply, primary conductor).
Ignoring this warning can lead to injury and or/or cause serious damage.
If applicable: 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 minimum 30 mm between the primary terminals of the transducer and other neighboring
components.
If applicable: Main supply must be able to be disconnected.
If applicable: Always inspect the flexible probe for damage before using this product.
If applicable: Never connect or disconnect the external power supply while the primary circuit is connected to live parts.
If applicable: Never connect the output to any equipment with a common mode voltage to earth greater than 30 V.
If applicable: Always wear protective clothing and gloves if hazardous live parts are present in the installation where themeasurement is carried out.
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.
If applicable: 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.
If CE marking not applicable: Although LEM applies utmost care to facilitate compliance of end products with applicableregulations during LEM product design, use of this part may need additional measures on the application side forcompliance with regulations regarding EMC and protection against electric shock.
Therefore, LEM cannot be held liable for any potential hazards, damages, injuries or loss of life resulting from the use ofthis product.

Underwriters Laboratory Inc. recognized component

Version history
Date

19/03/2024

Version

1.19

Comment

Tripping timing diagrams updated.
Architecture and Magnetic drawings.
Dimension drawing updated.
Various parameter fixes.

Page 21 of 21

G20001ASDA/Version 1.19

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

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