LAH 125-P

## **Current Transducer LAH 125-P** 

## _I_ **= 125 A** P N 

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

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||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
|Electrical data|
|LC|
|I|P N|Primary nominal RMS current|125|A|
|I|P M|Primary current, measuring range|0 ... ±200|A|
|R|M|Measuring resistance @|T|A = 70 °C|T|A = 85 °C|
|R|M min|R|M|max|R|M|min|R|M|max|
|with ±12 V|@ ±125 Amax|0|49|14|48|Ω|
|@ ±200 Amax|0|14|14|15|Ω|
|with ±15 V|@ ±125 Amax|22|72|29|70|Ω|
|@ ±200 Amax|22|28|29|29|Ω|
|I|S N|Secondary nominal RMS current|125|mA|
|N|P/|N|S Turns ratio|1 : 1000|
|U|C|Supply voltage (±5 %)|±12 ... 15|V|
|I|C|Current consumption|19|(@ ±15 V) +|I|S|mA|
|Accuracy - Dynamic performance data|
|LC|
|ε|tot|Total error @|I|P N,|T|A = 25 °C|±0.41|%|
|ε|L|Linearity error|< 0.15|%|
|Typ|Max|
|I|O|Offset current referred to primary @|I|P = 0,|T|A = 25|°C|±200|mA|
|I|O|Offset current referred to secondary @|I|P = 0,|T|A = 25|°C|±0.20|mA|
|I|O M|Magnetic offset current|[1)]|@|I|P = 0, referred to secondary|
|and specified|R|M, after an overload of 3 ×|I|P N|±0.20|mA|
|I|O|T|Temperature variation of|I|O, referred to secondary|
|‒25 °C ... +70 °C|±0.22|±0.65|mA|
|‒40 °C ... +85 °C|±0.30|±0.95|mA|
|t|D 10|Delay time to 10 % of the final output value for|I|P N step|< 500|ns|
|t|D 90|Delay time to 90 % of the final output value for|I|P N step|[2)]|< 1000|ns|
|BW|Frequency bandwidth (‒3 dB) @|I|P N|DC ... 100|kHz|

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## ~~**Accuracy - Dynamic performance data** LC~~ 

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|---|---|---|---|---|---|---|
|General data|
|Lo|
|T|A|Ambient operating temperature|‒40 ... +85|°C|
|T|A st Ambient storage temperature|‒40 ... +90|°C|
|R|S|Resistance of secondary winding    @|T|A = 70 °C|34|Ω|
|@|T|A = 85 °C|35|Ω|
|m|Mass|30|g|
|Standard|EN 50178: 1997|

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## **Features** 

- ●Closed loop (compensated) current transducer using the Hall effect 

- ●Printed circuit board mounting. 

## **Advantages** 

- ●Excellent accuracy 

- ●Very good linearity 

- ●Low temperature drift 

- ●Optimized delay time 

- ●Wide frequency bandwidth 

- ●No insertion losses 

- ●High immunity to external interference 

- ●Current overload capability. 

## **Applications** 

- ●AC variable speed drives and servo motor drives 

- ●Static converters for DC motor drives 

- ●Battery supplied applications 

- ●Uninterruptible Power Supplies (UPS) 

- ●Switched Mode Power Supplies (SMPS) 

- ●Power supplies for welding applications. 

## **Application Domain** 

- ●Industrial. 

Notes: 1) The result of the coercive field of the magnetic circuit 

> 2) For a d _i_ / d _t_ = 100 A/µs. 

N° 97.34.36.000.0 

Page 1/4 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

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

18April2023/Version 10 

## **Current Transducer LAH 125-P** 

## ~~**Insulation coordination**~~ 

|_U_d|RMS voltage for AC insulation test, 50 Hz, 1 min|5|kV|
|---|---|---|---|
|_U_Ni|Impulse withstand voltage 1.2/50 µs|12|kV|
|_U_t|Partial discharge RMS test voltage (_q_m< 10 pC)|> 2|kV|
|||Min||
|_d_Cp|Creepage distance1)|14.25|mm|
|_d_CI|Clearance1)|14.25|mm|
|_CTI_|Comparative tracking index (group IIIa)|175||



Note:[1) ] On PCB with soldering pattern UTEC93-703. 

## **Applications examples** 

**According to EN 50178 and IEC 61010-1 standards** and following conditions: 

- ●Over voltage category OV 3 

- ●Pollution degree PD2 

- ●Non-uniform field. 

||**EN 50178**|**IEC 61010-1**|
|---|---|---|
|_d_Cp**,**_d_CI**,** _U_Ni|Rated insulation voltage|Nominal voltage|
|Basic insulation|1250 V|1000 V|
|Reinforced insulation|630 V|600 V|



## **Safety** 

This 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 in accordance 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. Main supply must be able to be disconnected. 

N° 97.34.36.000.0 

Page 2/4 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

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

18April2023/Version 10 

## **UL 508: Rating and assumptions of certification** 

File # E189713 Vol:2 Sec:1 

## **Standards** 

USR indicated investigation to the Standard for Industrial Control Equipment UL 508, Seventeenth Edition. 

CNR indicated investigation to the Canadian Standard for Industrial Control Equipment CSA C22.2 No. 14-10, Eleventh Edition. 

## **Ratings** 

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Parameter Unit Standard Value Derating Value<br>**----- End of picture text -----**<br>


|**Parameter**|**Unit**|**Standard Value**|**Derating Value**|
|---|---|---|---|
|||||
|Primary involved potential|V AC/DC|600|600|
|Primary current|A AC/DC|125|86|
|Secondary supply voltage|V DC|0 ...±15 V|0 ...±13.5 V|
|Output signal|mA|0 ... 125|0 ... 86|
|Max surrounding air temperature|°C|85|95|



## **Use** 

For use only in complete equipment where the acceptability of the combination is determined by Underwriters Laboratories Inc. 

## **Conditions of acceptability** 

When installed in the end-use equipment, consideration shall be given to the following: 

_1. These devices must be mounted in a suitable end-use enclosure._ 

_2. The terminals have not been evaluated for field wiring._ 

_3. The LAH Series is intended to be mounted on the printed wiring board of the end-use equipment (with a minimum CTI of 100)._ 

_4. The LAH Series shall be used in a pollution degree 2 environment._ 

_5. LAH Series shall be mounted on the load side of line filters._ 

_6. 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 primary circuit (other than through the grounding means)._ 

_7. LAH Series: Based on results of temperature tests, in the end use application, a maximum of 100 °C cannot be exceeded at soldering point between primary coil pin and soldering point or on the primary bus bar (corrected to the appropriate evaluated max. surrounding air)._ 

## **Marking** 

Only those products bearing the UL or UR mark should be considered to be listed or recognized and covered under UL's Followup services. Always look for the mark on the product. 

Page 3/4 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

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

18April2023/Version 10 

## **Dimensions LAH 125-P** (in mm) 

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dCp dCI<br>d CI d Cp<br>14.25 14.25<br>Connection<br>I P I S R M<br>+ U C<br>- U C<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- ●General tolerance 

- ●Fastening & connection of primary Recommended PCB hole 

- ●Fastening & connection of secondary Recommended PCB hole 

- ±0.2 mm 

- 8 pins 1.4 × 1 mm 

- 2 mm 

- 3 pins 0.7 × 0.6 mm 

- 1.2 mm 

## **Remarks** 

- ●The temperature of the primary circuit board trace connected to the primrary pins of the transducer should not exceed 100 °C during operation. 

- _I_ S is positive when _I_ P flows in the direction of the arrow. 

- ●This is a standard model. For different versions (supply voltages, turns ratios, unidirectional measurements...), please contact us. 

Page 4/4 

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

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

18April2023/Version 10