HTRS 30-SBI

## **Current Transducer HTRS series** 

## _I_ **= 10, 30, 50 A** P N 

## **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** 

- ●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. 

## **Advantages** 

- ●Easy mounting 

## **Standards** 

- ●UL508 : 2010 

- ●EN 50121-4 : 2015[1)] 

- ●EN 50124-1 : 2017 

- ●EN 50125-3 : 2003. 

## **Application Domain** 

   - ●Track side. 

- ●Small size and space saving 

- ●No insertion losses 

- ●Non-contact measurement (doesn't need a safety case). 

## **Applications** 

- ●Points condition monitoring 

- ●Signal light indication 

- ●Battery supplied applications 

- ●Uninterruptable Power Supplies (UPS). 

## Note: 

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

Page 1/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

N° 52.D7.13.000.0, N° 52.D7.20.000.0, N° 52.D7.25.000.0 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Safety** 

⚠ Caution 

If 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 equipment 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 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 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. 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. 

Page 2/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Absolute maximum ratings** 

|**Parameter**|**Symbol**|**Unit**|**Value**|
|---|---|---|---|
|Maximum supply voltage (working) (−40 … +85 °C)|_U_C max|V|26|
|Maximum primary conductor temperature|_T_B 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** 

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Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Ambient operating temperature|_T_A|°C|−40||85||
|Ambient storage temperature|_T_A st|°C|−40||85||
|Mass|_m_|g||35|||
|Ingress protection rating||||IP40||According to IEC<br>60529|



Page 3/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Insulation coordination** 

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**----- Start of picture text -----**<br>
Parameter Symbol Unit ≤  Value Comment<br>**----- End of picture text -----**<br>


||**Symbol**|**Unit**|_≤_**Value**|_≤_**Value**|
|---|---|---|---|---|
||||||
|RMS voltage for AC insulation test, 50 Hz, 1 min|_U_d|kV|6||
|Impulse withstand voltage 1.2/50 μs|_U_Ni|kV|11||
|Partial discharge RMS test voltage (_q_m< 10 pC)|_U_t|V|1537||
|Clearance (pri. - PCBA.)|_d_CI|mm|12.7|Shortest distance through air from<br>primary to PCBA|
|Creepage distance (pri. - PCBA.)|_d_Cp|mm|12.7|Shortest path along device body<br>from primary to PCBA|
|Case material|-|-|V0|According to UL 94|
|Comparative tracking index|_CTI_|V|250||
|Application example<br>RMS voltage line-to-neutral||V|1270|Basic insulation according to<br>IEC 50124-1<br>CAT II, PD2|
|Application example<br>RMS voltage line-to-neutral||V|600|Reinforced insulation according to<br>IEC 50124-1<br>CAT II, PD2|



Page 4/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Electrical data of HTRS 10-SBI** 

At _T_ A = 25 °C , _U_ C = 24 V , _N_ P = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values" paragraph, see page 8). 

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Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal RMS current|_I_P N|A||10|||
|Primary current, measuring range|_I_P M|A|−20||20||
|Measuring resistance|_R_M|Ω|50|100|250||
|Output current|_I_out|mA|4||20|details see fgure 1|
|Output current @_I_P= 0 A|_I_out|mA||12|||
|DC supply voltage|_U_C|V|11.5|24|26||
|DC current consumption1)|_I_C|mA|||50||
|Error2) 3)|_ε_|% of_I_P N|−2||2||
|Error @_T_A= 85 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Error @_T_A= −40 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Electrical ofset current|_I_O E|mA|−0.1||0.1||
|Temperature coefcient of_I_O E|_TCI_O E|mA/K|−0.002||0.002||
|Magnetic ofset current (@ 3 ×_I_P N)|_I_O M|mA|−0.04||0.04||
|Sensitivity|_S_|mA/A||0.4|||
|Sensitivity error|_εS_|% of_I_P N|−1.8||1.8|factory adjustment|
|Temperature coefcient of_S_|_TCS_|% of_I_P N/K|−0.017||0.017||
|Linearity error|_ε_L|% of_I_P N|−0.5||0.5||
|RMS noise voltage DC to 10 kHz|_U_no|mVpp||15||with RL = 100ohm|
|Delay time to 10 % of the fnal output value<br>for_I_P Nstep4)|_t_D 10|µs|||10||
|Delay time to 90 % of the fnal output value<br>for_I_P Nstep4)|_t_D 90|µs|||20||
|Frequency bandwidth (−3 dB)|_BW_|KHz|30||||



Notes:[1)] Including _I_ out 

2) Excludes electrical offset 

3) Includes linearity with the conductor in the center of the aperture 

> 4) For a d _i_ / d _t_ = 30 A/µs. 

Page 5/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Electrical data of HTRS 30-SBI** 

At _T_ A = 25 °C , _U_ C = 24 V , _N_ P = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values" paragraph, see page 8). 

**==> picture [512 x 22] intentionally omitted <==**

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Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal RMS current|_I_P N|A||30|||
|Primary current, measuring range|_I_P M|A|−60||60||
|Measuring resistance|_R_M|Ω|50|100|250||
|Output current|_I_out|mA|4||20|details see fgure 1|
|Output current @_I_P= 0 A|_I_out|mA||12|||
|DC supply voltage|_U_C|V|11.5|24|26||
|DC current consumption1)|_I_C|mA|||50||
|Error2) 3)|_ε_|% of_I_P N|−2||2||
|Error @_T_A= 85 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Error @_T_A= −40 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Electrical ofset current|_I_O E|mA|−0.1||0.1||
|Temperature coefcient of_I_O E|_TCI_O E|mA/K|−0.002||0.002||
|Magnetic ofset current (@ 3 ×_I_P N)|_I_O M|mA|−0.04||0.04||
|Sensitivity|_S_|mA/A||4/30|||
|Sensitivity error|_εS_|% of_I_P N|−1.8||1.8|factory adjustment|
|Temperature coefcient of_S_|_TCS_|% of_I_P N/K|−0.017||0.017||
|Linearity error|_ε_L|% of_I_P N|−0.5||0.5||
|RMS noise voltage DC to 10 kHz|_U_no|mVpp||15||with RL = 100ohm|
|Delay time to 10 % of the fnal output value<br>for_I_P Nstep4)|_t_D 10|µs|||10||
|Delay time to 90 % of the fnal output value<br>for_I_P Nstep4)|_t_D 90|µs|||20||
|Frequency bandwidth (−3 dB)|_BW_|KHz|30||||



Notes:[1)] Including _I_ out 

2) Excludes electrical offset 

3) Includes linearity with the conductor in the center of the aperture 

> 4) For a d _i_ / d _t_ = 30 A/µs. 

Page 6/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Electrical data of HTRS 50-SBI** 

At _T_ A = 25 °C , _U_ C = 24 V , _N_ P = 1 turn, unless otherwise noted (see "Definition of typical, minimum and maximum values" paragraph, see page 8). 

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**----- Start of picture text -----**<br>
Parameter Symbol Unit Min Typ Max Comment<br>**----- End of picture text -----**<br>


|**Parameter**|**Symbol**|**Unit**|**Min**|**Typ**|**Max**|**Comment**|
|---|---|---|---|---|---|---|
||||||||
|Primary nominal RMS current|_I_P N|A||50|||
|Primary current, measuring range|_I_P M|A|−100||100||
|Measuring resistance|_R_M|Ω|50|100|250||
|Output current|_I_out|mA|4||20|details see fgure 1|
|Output current @_I_P= 0 A|_I_out|mA||12|||
|DC supply voltage|_U_C|V|11.5|24|26||
|DC current consumption1)|_I_C|mA|||50||
|Error2) 3)|_ε_|% of_I_P N|−2||2||
|Error @_T_A= 85 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Error @_T_A= −40 °C2) 3)|_ε_|% of_I_P N|−3||3||
|Electrical ofset current|_I_O E|mA|−0.1||0.1||
|Temperature coefcient of_I_O E|_TCI_O E|mA/K|−0.002||0.002||
|Magnetic ofset current (@ 3 ×_I_P N)|_I_O M|mA|−0.04||0.04||
|Sensitivity|_S_|mA/A||0.08|||
|Sensitivity error|_εS_|% of_I_P N|−1.8||1.8|factory adjustment|
|Temperature coefcient of_S_|_TCS_|% of_I_P N/K|−0.017||0.017||
|Linearity error|_ε_L|% of_I_P N|−0.5||0.5||
|RMS noise voltage DC to 10 kHz|_U_no|mVpp||15||with RL = 100ohm|
|Delay time to 10 % of the fnal output value<br>for_I_P Nstep4)|_t_D 10|µs|||10||
|Delay time to 90 % of the fnal output value<br>for_I_P Nstep4)|_t_D 90|µs|||20||
|Frequency bandwidth (−3 dB)|_BW_|KHz|30||||



Notes:[1)] Including _I_ out 2) Excludes electrical offset 

3) Includes linearity with the conductor in the center of the aperture 

> 4) For a d _i_ / d _t_ = 30 A/µs. 

Page 7/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**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 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 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. 

## **Typical performance characteristics** 

Figure 1: Transfer characteristics 

Figure 2: Frequency response 

Page 8/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Terms and definitions** 

## **Ampere-turns and amperes** 

The transducer is sensitive to the primary current linkage _Θ_ P (also called ampere-turns). 

_Θ_ P = _N_ P · _I_ P 

Where _N_ P is the number of primary turn (depending on the connection of the primary jumpers). 

Caution: As most applications will use the transducer with only one single primary turn ( _N_ P = 1), much of this datasheet is written in terms of primary current instead of current linkages. However, the ampere-turns (A) unit is used to emphasis that current linkages are intended and applicable. 

## **Simplified transducer model** 

The static model of the transducer with current output at temperature _T_ A is: 

_I_ out = _S_ · _Θ_ P · (1 + _ε_ ) 

In which (referred to primary): 

_ε_ · _Θ_ P = _I_ O E + _I_ O _T_ + _εS_ · _Θ_ P  + _εS T_ · _Θ_ P  + _ε_ L( _Θ_ P max) · _Θ_ P max + _I_ O M 

- _Θ_ P = _N_ P · _I_ P : primary current linkage (A) 

- _Θ_ P max :  maximum primary current linkage applied to the transducer 

- _I_ out : Output current (A) 

- _S_ : sensitivity of the transducer _T_ A : ambient operating temperature (°C) 

- _I_ O E : electrical offset current (A) 

- _I_ O M : magnetic offset current (A) 

- _I_ O _T_ : temperature variation of _I_ O E (A) 

- _εS_ : sensitivity error at 25 °C 

- _εS T_ : thermal drift of _S_ 

- _ε_ L( _Θ_ P max) : linearity error for _Θ_ P max 

This model is valid for primary ampere-turns _Θ_ P between − _Θ_ P max and + _Θ_ P 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: 

**==> picture [50 x 36] intentionally omitted <==**

## **Total error referred to primary** 

The total error _ε_ tot is the error at ± _I_ P N, relative to the rated value _I_ P N. 

It includes all errors mentioned above 

- ●the electrical offset _I_ O E 

- ●the magnetic offset _I_ O M 

**==> picture [235 x 164] intentionally omitted <==**

**----- Start of picture text -----**<br>
Total error  ℇ tot<br>0.12 at  U C = ... V and  T A = 25 °C<br>aver. + 3σ<br>0.10<br>0.08<br>0.06 I O M (max) /  I P N<br>=<br>0.04<br>I O E (max) /  I P N<br>0.02<br>0.00<br>-0.02<br>-1 -0.5 0 0.5 1<br>I P / ( K OL ·  I P N) with  K OL = 1 ... 10<br> (% ) I P N<br>tot<br>ℇ<br>**----- End of picture text -----**<br>


Figure 3: Total error _ε_ tot 

## **Electrical offset referred to primary** 

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

**==> picture [89 x 29] intentionally omitted <==**

The temperature variation _I_ O _T_ of the electrical offset current _I_ O E is the variation of the electrical offset from 25 °C to the considered temperature. 

**==> picture [133 x 15] intentionally omitted <==**

## **Magnetic offset referred to primary** 

The magnetic offset current on the primary side (“memory effect” of the transducer’s ferro- _I_ O M is the consequence of a current magnetic parts). It is measured using the following primary current cycle. _I_ O M depends on the current value _I_ P _≥ I_ P N. 

**==> picture [234 x 131] intentionally omitted <==**

**----- Start of picture text -----**<br>
Primary current cycle<br>1<br>0<br>-1<br>1 2 3 4 5<br>Step<br>)<br>N<br>P<br>I<br> ·<br> = 1 .. 10<br>OL OL<br>K K<br> / (<br>P<br>I with<br>**----- End of picture text -----**<br>


- ●the sensitivity error _ε S_ 

- ●the linearity error _ε_ L (to _I_ P N). 

## _K_ OL: Overload factor 

Figure 4:  Current cycle used to measure magnetic and electrical offset (transducer supplied) 

**==> picture [94 x 30] intentionally omitted <==**

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28March2023/Version 1 

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

**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 _I_ P, then to − _I_ P and back to 0 (equally spaced _I_ P/10 steps). The sensitivity _S_ is defined as the slope of the linear regression line for a cycle between ± _I_ P N. 

The linearity error difference between the measured points and the linear _ε_ L is the maximum positive or negative regression line, expressed in % of _I_ P N. 

## **Delay times** 

The delay time respect to the primary are shown in the next figure. _t_ D 10 @ 10 % and the delay time _t_ D 90 @ 90 % with Both slightly depend on the primary current d _i_ /d _t_ . They are measured at nominal current. 

**==> picture [214 x 144] intentionally omitted <==**

**----- Start of picture text -----**<br>
I<br>100 %<br>90 %<br>I P IS<br>t D 90<br>10 %<br>t D 10 t<br>**----- End of picture text -----**<br>


Figure 5: _t_ D 10 (delay time @ 10 %) and _t_ D 90 (delay time @ 90 %). 

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28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Dimensions** (in mm) 

**==> picture [510 x 381] intentionally omitted <==**

**----- Start of picture text -----**<br>
Connection<br>U C<br>U C<br>R M IR ou M t I o ut I P I P<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- ●General tolerance 

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

## **Remarks** 

- _I_ S is positive when _I_ P 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, unless otherwise 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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28March2023/Version 1 

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

**HTRS 10, 30, 50-SBI** 

## **Installation information** 

**==> picture [242 x 44] intentionally omitted <==**

Page 12/12 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

28March2023/Version 1 

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