LA 25-P

## **Current Transducer LA 25-P** 

## _I_ **= 25 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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|---|---|---|---|---|---|---|
|_I_P N<br>_I_P M|Primary nominal RMS current<br>Primary current, measuring range|||25<br>0 ... ±55||A<br>A|
|_R_M|Measuring resistance|Measuring resistance|_T_A= 70 °C<br>_T_A= 85 °C||||
||||_R_M min|_R_M max_R_M min|_R_M max||
||with ±12 V|@ ±25 Amax|10|280<br>60|275|Ω|
|||@ ±55 Amax|10|80<br>60|75|Ω|
||with ±15 V|@ ±25 Amax|50|400<br>135|395|Ω|
|_I_S N|@ ±55 Amax<br>Secondary nominal RMS current||50|140<br>135<br>25|135|Ω<br>mA|
|_N_P/_N_STurns ratio|Turns ratio|||1 : 1000|||
|_U_C|Supply voltage (±5 %)|Supply voltage (±5 %)||±12 ... 15|±12 ... 15|V|
||||Min|Min<br>Typ|Max||
|_I_C|Current consumption|Current consumption<br>@ ±15 V|8+_I_S10+_I_S||12+_I_S|mA|



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

_ε_ Error @ _I_ P N, _T_ A = 25 °C @ ±15 V (±5 %) ±0.95 % @ ±12 ... 15 V (±5 %) ±1.25 % _ε_ L Linearity error < 0.15 % Typ Max _I_ O E Electrical offset current @ _I_ P = 0, _T_ A = 25 °C ±0.2 mA _I_ O M Magnetic offset current[1)] @ _I_ P = 0 and specified _R_ M, after an overload of 3 × _I_ P N ±0.3 mA _I_ O _T_ Temperature variation of _I_ O 0 °C ... +70 °C ±0.1 ±0.5 mA −25 °C ... +85 °C ±0.1 ±0.6 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)] < 1 µs _BW_ Frequency bandwidth (−1 dB) DC ... 200 kHz 

## ~~**General data** Lo~~ 

|_T_A|Ambient operating temperature||−25 ... +85|°C|
|---|---|---|---|---|
|_T_A st<br>_R_S|Ambient storage temperature<br>Resistance of secondary winding|@_T_A= 70 °C|−40 ... +90<br>80|°C<br>Ω|
|||@_T_A= 85 °C|85|Ω|
|_m_|Mass||16|g|
||Standard||EN 50178: 1997||



## **Features** 

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

- ●Insulating plastic case recognized according to UL 94-V0. 

## **Advantages** 

- ●Excellent accuracy 

- ●Very good linearity 

- ●Low temperature drift 

- ●Optimized response 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)] Result of the coercive field of the magnetic circuit 

> 2)  For a d _i_ /d _t_ = 200 A/us. 

N° 97.13.19.000.0 

Page 1/3 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

24November2023\Version 6 

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

## **Current Transducer LA 25-P** 

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

|_U_d|RMS voltage for AC insulation test, 50 Hz, 1 min|3|kV|
|---|---|---|---|
|_U_Ni|Impulse withstand voltage 1.2/50 µs|5.7|kV|
|||Min||
|_d_Cp|Creepage distance|5|mm|
|_d_CI|Clearance|5|mm|
|_CTI_|Comparative tracking index (group I)|600||



## **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|EN 50178|IEC 61010-1|
|---|---|---|
|_d_Cp,_d_CI,_U_Ni|Rated insulation voltage|Nominal voltage|
|Basic insulation|500 V|500 V|
|Reinforced insulation|250 V|250 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. 

Page 2/3 LEM International SA Route du Nant-d’Avril, 152 1217 Meyrin www.lem.com 

24November2023\Version 6 

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

## **Dimensions LA 25-P** (in mm) 

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## **Mechanical characteristics** 

- ●General tolerance 

- ●Primary through-hole 

- ●Fastening & connection of secondary 

- ●Recommended PCB hole 

±0.2 mm 

12.7 × 7 mm 

- 3 pins 

- 0.6 × 0.7 mm 

- ⌀ 1.2 mm 

## **Remarks** 

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

- ●Temperature of the primary conductor should not exceed 90 °C. 

- ●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** 

- ●Dynamic performances ( d _i_ /d _t_ and delay time) are best with a single bar completely filling the primary hole. 

- ●In order to achieve the best magnetic coupling, the primary windings have to be wound over the top edge of the device. 

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

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

24November2023\Version 6 

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