Current Transducer HTRS series

IP N = 10, 30, 50 A

Ref: HTRS 10-SBI, HTRS 30-SBI, HTRS 50-SBI
For the electronic measurement of current: DC, AC, pulsed..., with galvanic separation between
the primary and the secondary circuit.

Features

Standards● Open loop current transducer using the Hall effect● Panel mounting● Split core design for easy installation● Insulating plastic case recognized according to UL 94-V0● Reverse polarity protected.

● UL508 : 2010

Advantages

Application Domain● Easy mounting● Small size and space saving● No insertion losses● Non-contact measurement (doesn't need a safety case).

● Track side.

Applications● Points condition monitoring● Signal light indication● Battery supplied applications● Uninterruptable Power Supplies (UPS).

N° 52.D7.13.000.0, N° 52.D7.20.000.0, N° 52.D7.25.000.0
28March2023/Version 1● EN 50121-4 : 2015 1)● EN 50124-1 : 2017
● EN 50125-3 : 2003.

Note:
Immunity to "Radio-frequency electromagnetic field",according to EN 61000-4-3, is used shield wire with both endsof shielding layer ground.
1)

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HTRS 10, 30, 50-SBI
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.
Do not dispose of this product as unsorted municipal waste. Contact a qualified recycler for disposal.

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HTRS 10, 30, 50-SBI
Absolute maximum ratings
Parameter

Symbol

Unit

Value

Maximum supply voltage (working) (−40 … +85 °C)

UC maxV

26

Maximum primary conductor temperature

TB max°C

90

Absolute maximum ratings apply at 25 °C unless otherwise noted.
Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade reliability.

Environmental and mechanical characteristics
Parameter

SymbolUnit

Min

Ambient operating temperature

TA

°C

−40

85

Ambient storage temperature

TA st

°C

−40

85

Mass

m

g

Ingress protection rating

Typ

Max

Comment

35
IP40

According to IEC
60529

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HTRS 10, 30, 50-SBI
Insulation coordination
Parameter

SymbolUnit≤ Value

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

Ud

kV

6

Impulse withstand voltage 1.2/50 μs

UNi

kV

11

Partial discharge RMS test voltage (qm < 10 pC)

Ut

V

1537

Clearance (pri. - PCBA.)

dCI

mm

12.7

Shortest distance through air fromprimary to PCBA

Creepage distance (pri. - PCBA.)

dCp

mm

12.7

Shortest path along device bodyfrom primary to PCBA

Case material

-

-

V0

According to UL 94

Comparative tracking index

CTI

V

250

Application example
RMS voltage line-to-neutral

V

1270

Basic insulation according to
IEC 50124-1
CAT II, PD2

Application example
RMS voltage line-to-neutralV

600

Reinforced insulation according to
IEC 50124-1
CAT II, PD2

Comment

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HTRS 10, 30, 50-SBI
Electrical data of HTRS 10-SBI
At TA = 25 °C , UC = 24 V , NP = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values"
paragraph, see page 8).

Parameter

SymbolUnit

Primary nominal RMS current

IP N

A

Primary current, measuring range

IP M

A

−20

Measuring resistance

RM

Ω

50

Output current

Iout

mA

4

Output current @ IP = 0 A

Iout

mA

DC supply voltage

UCV

DC current consumption 1)

IC

mA

Error 2) 3)ε% of IP N

−2

2

ε

% of IP N

−3

3

ε

% of IP N−3

3Electrical offset current

IO E

mA

−0.1

0.1

Temperature coefficient of IO E

TCIO E

mA/K−0.002

0.002

Magnetic offset current (@ 3 × IP N)

IO M

mA

−0.04

0.04

Sensitivity

S

mA/A

Sensitivity errorεS% of IP N

−1.8

1.8

Temperature coefficient of S

TCS

% of IP N/K −0.017

0.017

Linearity errorεL% of IP N

0.5

RMS noise voltage DC to 10 kHz

Uno

mVpp

Delay time to 10 % of the final output value
for IP N step 4)

tD 10

µs

10

Delay time to 90 % of the final output value
for IP N step 4)

tD 90

µs

20

Frequency bandwidth (−3 dB)

BW

KHz

Error @ TA = 85 °C2) 3)

Error @ TA = −40 °C

2) 3)

Min

Typ

Max

Comment

10
20
100

250
20

details see figure 1

12
11.5

24

26
50

0.4

−0.5
15

factory adjustment

with RL = 100ohm

30

Notes: 1) Including Iout													2)Excludes electrical offset												3)Includes linearity with the conductor in the center of the aperture							4)For a di/dt = 30 A/µs.

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HTRS 10, 30, 50-SBI
Electrical data of HTRS 30-SBI
At TA = 25 °C , UC = 24 V , NP = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values"
paragraph, see page 8).

Parameter

SymbolUnit

Primary nominal RMS current

IP N

A

Primary current, measuring range

IP M

A

−60

Measuring resistance

RM

Ω

50

Output current

Iout

mA

4

Output current @ IP = 0 A

Iout

mA

DC supply voltage

UCV

DC current consumption 1)

IC

mA

Error 2) 3)ε% of IP N

−2

2

ε

% of IP N

−3

3

ε

% of IP N−3

3Electrical offset current

IO E

mA

−0.1

0.1

Temperature coefficient of IO E

TCIO E

mA/K−0.002

0.002

Magnetic offset current (@ 3 × IP N)

IO M

mA

−0.04

0.04

Sensitivity

S

mA/A

Sensitivity errorεS% of IP N

−1.8

1.8

Temperature coefficient of S

TCS

% of IP N/K −0.017

0.017

Linearity errorεL% of IP N

0.5

RMS noise voltage DC to 10 kHz

Uno

mVpp

Delay time to 10 % of the final output value
for IP N step 4)

tD 10

µs

10

Delay time to 90 % of the final output value
for IP N step 4)

tD 90

µs

20

Frequency bandwidth (−3 dB)

BW

KHz

Error @ TA = 85 °C2) 3)

Error @ TA = −40 °C

2) 3)

Min

Typ

Max

Comment

30
60
100

250
20

details see figure 1

12
11.5

24

26
50

4/30

−0.5
15

factory adjustment

with RL = 100ohm

30

Notes: 1) Including Iout													2)Excludes electrical offset												3)Includes linearity with the conductor in the center of the aperture							
4)For a di/dt = 30 A/µs.

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HTRS 10, 30, 50-SBI
Electrical data of HTRS 50-SBI
At TA = 25 °C , UC = 24 V , NP = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values"
paragraph, see page 8).

SymbolUnit

Primary nominal RMS current

Parameter

IP N

APrimary current, measuring range

IP M

A

−100

Measuring resistance

RM

Ω

50

Output current

Iout

mA

4

Output current @ IP = 0 A

Iout

mA

DC supply voltage

UCV

DC current consumption 1)

IC

mA

Error

ε

% of IP N

−2

2

ε

% of IP N

−3

3

ε

% of IP N−3

3Electrical offset current

IO E

mA

−0.1

0.1

Temperature coefficient of IO E

TCIO E

mA/K−0.002

0.002

Magnetic offset current (@ 3 × IP N)

IO M

mA

−0.04

0.04

Sensitivity

S

mA/A

Sensitivity errorεS% of IP N

−1.8

1.8

Temperature coefficient of S

TCS

% of IP N/K −0.017

0.017

Linearity errorεL% of IP N

0.5

RMS noise voltage DC to 10 kHz

Uno

mVpp

Delay time to 10 % of the final output value
for IP N step 4)

tD 10

µs

10

Delay time to 90 % of the final output value
for IP N step 4)

tD 90

µs

20

Frequency bandwidth (−3 dB)

BW

KHz

2) 3)

Error @ TA = 85 °C2) 3)

Error @ TA = −40 °C

2) 3)

Min

Typ

Max

Comment

50
100
100

250
20

details see figure 1

12
11.5

24

26
50

0.08

−0.5
15

factory adjustment

with RL = 100ohm

30

Notes: 1) Including Iout													2)Excludes electrical offset												3)Includes linearity with the conductor in the center of the aperture							
4)For a di/dt = 30 A/µs.

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HTRS 10, 30, 50-SBI
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 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 to aninterval between −sigma and +sigma for a normal distribution.
Typical, maximal and minimal values are determined during the initial characterization of the product.

Typical performance characteristics

Figure 1: Transfer characteristics

Figure 2: Frequency response

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HTRS 10, 30, 50-SBI

Terms and definitions
Ampere-turns and amperes

Total error ℇtot
at UC = ... V and TA = 25 °C

0.12

aver. + 3σ

0.10
0.08
ℇtot (% IP N)

The transducer is sensitive to the primary current linkage ΘP(also called ampere-turns).
ΘP = NP · IP
Where NP is the number of primary turn (depending on theconnection of the primary jumpers).
Caution: As most applications will use the transducer with only
one single primary turn (NP = 1), much of this datasheet iswritten in terms of primary current instead of current linkages.
However, the ampere-turns (A) unit is used to emphasis thatcurrent linkages are intended and applicable.

IO M (max) / IP N

0.06

=

0.04

IO E (max) / IP N

0.02

Simplified transducer model

0.00

The static model of the transducer with current output attemperature TA is:
Iout = S · ΘP · (1 + ε)
In which (referred to primary):ε · ΘP = IO E + IO T + εS · ΘP + εS T · ΘP + εL(ΘP max) · ΘP max + IO M

-0.02

-1

-0.5
0
0.5
IP / (KOL · IP N) with KOL = 1 ... 10

1

Figure 3: Total error εtot

Electrical offset referred to primaryΘP = NP · IP : primary current linkage (A)ΘP max: maximum primary current linkage applied to thetransducer
Iout: Output current (A)S: sensitivity of the transducerTA: ambient operating temperature (°C)
IO E
: electrical offset current (A)IO M: magnetic offset current (A)IO T: temperature variation of IO E (A)εS: sensitivity error at 25 °C
εS T: thermal drift of S
εL(ΘP max) : linearity error for ΘP max

Using the current cycle shown in figure 3, the electrical offset
current IO E is the residual output referred to primary when the
input current is zero.

This model is valid for primary ampere-turns ΘP between−ΘP max and +ΘP max only.
This is the absolute maximum error. As all errors are
independent, a more realistic way to calculate the error would
be to use the following formula:

The magnetic offset current IO M is the consequence of a current
on the primary side (“memory effect” of the transducer’s ferromagnetic parts). It is measured using the following primary
current cycle. IO M depends on the current value IP ≥ IP N.

2

I O T (T ) = I O E (T ) − I O E ( 25 °C )Magnetic offset referred to primaryPrimary current cycle

N

i =1

Total error referred to primary
The total error εtot is the error at ±IP N, relative to the rated value
IP N.
It includes all errors mentioned above● the electrical offset IO E

with KOL = 1 .. 10

1

∑ε i

● the magnetic offset IO M

IP (3) + IP (5)The temperature variation IO T of the electrical offset current
IO E is the variation of the electrical offset from 25 °C to theconsidered temperature.

IP / (KOL · IP N)ε=

IO E =

0

-1

1

2

3

● the sensitivity error εS● the linearity error εL (to IP N).

4

5

Step

KOL: Overload factor
Figure 4: C urrent cycle used to measure magnetic andelectrical offset (transducer supplied)

IO M =IP (3) − IP (5)2Page 9/12

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HTRS 10, 30, 50-SBI

Performance parameters definition
Sensitivity and linearity
To measure sensitivity and linearity, the primary current (DC) is
cycled from 0 to IP, then to −IP and back to 0 (equally spaced
IP/10 steps). The sensitivity S is defined as the slope of thelinear regression line for a cycle between ±IP N.
The linearity error εL is the maximum positive or negative
difference between the measured points and the linear
regression line, expressed in % of IP N.

Delay times

The delay time tD 10 @ 10 % and the delay time tD 90 @ 90 % withrespect to the primary are shown in the next figure.
Both slightly depend on the primary current di/dt.
They are measured at nominal current.
I
100 %
90 %

IS

IP
tD 90
10 %

tD 10

t

Figure 5: tD 10 (delay time @ 10 %) andtD 90 (delay time @ 90 %).

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HTRS 10, 30, 50-SBI
Dimensions (in mm)

Connection
UC

UC

IoutI
RM RM

out

IP

IP

Mechanical characteristics● General tolerance● Transducer fastening
Recommended fastening torque● Connection of secondary±0.5 mm⌀ 4.3 mm
1.5 N·m
MOLEX 436500300

Remarks● IS is positive when IP flows in the direction of arrow.

● The secondary cables also have to be routed together all
the way.
● Installation of the transducer must be done, unlessotherwise specified on the datasheet, according to LEM
Transducer Generic Mounting Rules. Please refer to LEM
document N°ANE120504 available on our Web site:
https://www.lem.com/en/file/3137/download/.

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HTRS 10, 30, 50-SBI
Installation information

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