LA 25-NP

## **Current Transducer LA 25-NP** 

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

## 16080 

|~~**Electrical data**~~<br>~~ee~~|~~**Electrical data**~~<br>~~ee~~|~~**Electrical data**~~<br>~~ee~~|~~**Electrical data**~~<br>~~ee~~|~~**Electrical data**~~<br>~~ee~~|
|---|---|---|---|---|
|_I_P N<br>_I_P M|Primary nominal RMS current<br>Primary current, measuring range|Primary current, measuring range|25<br>0 … ±36|At<br>At|
|_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 ±15 V<br>@ ±25 Atmax<br>100<br>320<br>100<br>315|||Ω|
|_I_S N|@ ±36 Atmax<br>100<br>190<br>100<br>185<br>Secondary nominal RMS current<br>25|||Ω<br>mA|
|_N_P/_N_S|Turns ratio||1-2-3-4-5 : 1000||
|_U_C<br>Supply voltage (±5 %)<br>±15<br>V<br>_I_C<br>Current consumption<br>10+_I_S<br>mA<br>~~**Accuracy - Dynamic performance data**~~<br>~~ee~~|||||
|_ε_tot|Total error @_I_P N,_T_A= 25 °C||±0.5|%|
|_ε_L|Linearity error||< 0.2|%|
||||Typ<br>Max||
|_I_O<br>_I_O M|Offset current1)@_I_P= 0,_T_A= 25 °C<br>Magnetic offset current2)@_I_P= 0 and specified_R_M,||±0.05 ±0.15|mA|
||after an overload of 3 ×_I_P N||±0.05 ±0.15|mA|
|_I_O_T_|Temperature variation of_I_O|0 °C … +25 °C<br>+25 °C … +70 °C ±0.10 ±0.35|±0.06 ±0.25<br>+25 °C … +70 °C ±0.10 ±0.35|mA<br>mA|
|||−25 °C … +85 °C|−25 °C … +85 °C<br>±0.5|mA|
|||−40 °C … +85 °C|−40 °C … +85 °C<br>±1.2|mA|
|_t_D 90<br>_BW_|Delay time3)to 90 % of the final output value for_I_P Nstep < 1<br>Frequency bandwidth (−1 dB)<br>DC ... 150|||µs<br>kHz|
|~~**General data**~~<br>~~ee~~|||||
|_T_A|Ambient operating temperature||−40 ... +85|°C|
|_T_A st<br>_R_P|Ambient storage temperature<br>Resistance of primary (winding) @|Resistance of primary (winding) @_T_A= 25 °C|−45 ... +90<br>< 1.25|°C<br>mΩ|
|_R_S|Resistance of secondary winding @|Resistance of secondary winding @_T_A= 70 °C|110|Ω|
|||@_T_A= 85 °C|115|Ω|
|_R_INS|Insulation resistance @ 500 V,_T_A= 25 °C|= 25 °C|> 1500|MΩ|
|_m_|Mass||22|g|
||Standards||EN 50178: 1997||
||||UL 508: 2010||



_I_ **= 25 At** P N 

## **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) Measurement carried out after 15 mn functioning 

2) The result of the coercive field of the magnetic circuit 

- 3) For a d _i_ / d _t_ = 100 A/µs. 

Page 1/3 LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com 

N° 97.08.19.000.0 

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

16March2022/Version 16 

## **Current Transducer LA 25-NP** 

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

|_U_d|RMS voltage for AC insulation test, 50 Hz, 1 min|2.5|kV|
|---|---|---|---|
|_U_Ni|Impulse withstand voltage 1.2/50 µs|9|kV|
|||Min||
|_d_Cp|Creepage distance|10.63|mm|
|_d_CI|Clearance|10.63|mm|
|_CTI_|Comparative tracking index (group IIIa)|175||



## **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|1000 V|1000 V|
|Reinforced insulation|500 V|300 V|



## **Safety** 

This tran _sducer_ 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 reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com 

16March2022/Version 16 

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

**==> picture [510 x 281] intentionally omitted <==**

**----- Start of picture text -----**<br>
Connection<br>I P<br>d Cl  d Cp U C<br>10.63 mm 10.63 mm I S R M<br>I P<br>U C<br>I S R M<br>**----- End of picture text -----**<br>


**==> picture [510 x 254] intentionally omitted <==**

**----- Start of picture text -----**<br>
Number of  Primary current Nominal  Turns ratio  Primary  Primary insertion  Recommended<br>nominal  maximum  output current  resistance  inductance<br>primary turns I P N [A] I P [A] I S N [mA]       N P/ N S R P [mΩ] L P [µH] connections<br>                  5    4    3    2    1        IN<br>1 25 36 25 1 / 1000 0.3 0.023<br>     OUT      6    7    8    9    10<br>                  5    4    3    2    1        IN<br>2 12 18 24 2 / 1000 1.1 0.09<br>     OUT      6    7    8    9    10<br>                  5    4    3    2    1        IN<br>3 8 12 24 3 / 1000 2.5 0.21<br>     OUT      6    7    8    9    10<br>                  5    4    3    2    1        IN<br>4 6 9 24 4 / 1000 4.4 0.37<br>     OUT      6    7    8    9    10<br>                  5    4    3    2    1        IN<br>5 5 7 25 5 / 1000 6.3 0.58<br>     OUT      6    7    8    9    10<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- ●General tolerance 

●General tolerance ±0.2 mm ●Fastening & connection of primary 10 pins 0.7 × 0.6 mm ●Fastening & connection of secondary 3 pins ⌀ 1 mm ●Recommended PCB hole 1.2 mm 

## **Remarks** 

- _I_ S is positive when _I_ P flows from terminals 1, 2, 3, 4, 5 to terminals 10, 9, 8, 7, 6. 

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

Page 3/3 

LEM reserves the right to carry out modifications on its transducers, in order to improve them, without prior notice 

LEM International SA Chemin des Aulx 8 1228 PLAN-LES-OUATES Switzerland www.lem.com 

16March2022/Version 16