# Current Transducer, LAH Series, 25A, -55A to 55A, 0.3 %, Closed Loop Output, 12 Vdc to 15 Vdc

![Product image](https://novapart.co/image/farnell:2146849/)

**URL**: https://novapart.co/products/LAH%2025-NP/current-transducer-lah-series-25a-55a-to-03-closed
**SKU**: LAH 25-NP
**Manufacturer**: LEM
**Category**: Sensors & Transducers || Sensors || Current Sensors
**Price**: €17.9100
**Stock**: 1000+
**Lead Time**: 50 days (indicative)

## Description

Sensor Output:Closed Loop; Supply Voltage DC Min:-; Supply Voltage DC Max:-; Current Measuring Range DC:-; Current Measuring Range AC:-; Response Time:-; Accuracy %:0.3%; Product Range:-; SV

## Specifications

| Parameter | Value |
|---|---|
| Svhc | No SVHC (25-Jun-2025) |
| Accuracy | 0.3% |
| Accuracy % | 0.3% |
| Product Range | LAH Series |
| Primary Current | 25A |
| Sensor Mounting | Through Hole |
| Measured Current | AC / DC / Pulsed |
| Sensor Output Type | Closed Loop |
| Supply Voltage Range | ± 12V to ± 15V |
| Current Sensor Technology | Closed Loop, Hall Effect |
| Operating Temperature Max | 85°C |
| Operating Temperature Min | -25°C |

## Datasheet

📄 [Download PDF](https://novapart.co/datasheet/farnell:2146849/)

## **Current Transducer LAH 25-NP** 

## **I = 8-12-25 A PN** 

For the electronic measurement of currents: DC, AC, pulsed ..., with a galvanic isolation between the primary circuit (high power) and the secondary circuit (electronic circuit). AeANSOo~ 

2002/95/EC 16038 

## **Electrical data** 

|**I**PN||Primary nominal current rms||25|At|
|---|---|---|---|---|---|
|**I**PM||Primary current, measuring range1)||0 .. 55|At|
|**R**M||Measuring resistance @2)|**T**A= 70°C|= 70°C<br>**T**A= 85°C||
||||**R**M mini**R**M maxi **R**M mini**R**M maxi|||
|||with ± 12 V<br>@**I**PN[±  AtDC]<br>@**I**PN[AtRMS]3<br>)<br>with ± 15 V<br>@**I**PN[±  AtDC]<br>@**I**PN[AtRMS]<br>3)|0<br>0<br>67<br>67|284<br>0<br>280<br>182<br>0<br>178<br>398<br>70<br>394<br>263<br>70<br>259|Ω<br>Ω<br>Ω<br>Ω|
|**I**SN||@**I**P<**I**PN<br>4)<br>Secondary nominal current rms||25|mA|
|**K **N<br>Conversion ratio<br>**V**C<br>Supply  voltage (± 5 %)<br>**I**C<br>Current consumption<br>**Accuracy - Dynamic performance data**<br>**X**<br>Accuracy5)@**I**PN, **T**A= 25°C<br>**ε**L<br>Linearity error||||1 - 2 - 3 : 1000<br>± 12 .. 15<br>V<br>10(@ ± 15V) +**I**SmA<br>± 0.3<br>%<br>< 0.2<br>%<br>Typ<br>Maxi||
|**I**O<br>**I**OM||Offset current @**T**A= 25°C<br>Magnetic offset current @**I**P= 0 and specified**R**M,||± 0.15|mA|
|**I**OT||after an overload of 5 x**I**PN<br>Temperature variation of**I**O<br>0°C .. + 70°C||± 0.20 ± 0.25<br>± 0.10 ± 0.60|mA<br>mA|
|||- 25°C .. + 85°C|- 25°C .. + 85°C|± 0.10 ± 0.70|mA|
|**t**r a||Reaction time @ 10 % of**I**PN||< 200|ns|
|**t**r||Response time6)to 90 % of**I**PNstep||< 500|ns|
|**di/dt**||di/dt accurately followed||> 200|A/µs|
|**BW**||Frequency bandwidth (- 1 dB)||DC .. 200|kHz|
|**General data**<br>**T**A<br>Ambient operating temperature<br>**T**S<br>Ambient storage temperature<br>**R **S<br>Secondary coil resistance<br>@**T**A= 70°C<br>@**T**A= 85°C|||= 70°C<br>= 85°C|- 25 .. + 85<br>- 40 .. + 90<br>72<br>76|°C<br>°C<br>Ω<br>Ω|
|**_m_**||Mass<br>Standards||20<br>g<br>EN50178: 1997||
|Notes<br>:||1) During 10 s, with**R**M ≤109Ω (**V**C= ± 15 V)||||



- 2) Calculation of **R** M mini with the maxi. power of the transistors = 0.307W 

## **Features** 

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

- Printed circuit board mounting 

- Insulated 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. 

- @ 70°C and the maxi. power of the transistors = 0.302W @ 85°C 

- 3) 50 Hz Sinusoidal 

- 4) The measuring resistance **R** M mini may be lower (see "LAH Technical Information" leaflet) 

- 5) Without **I** & **I** O OM 

- 6) With a di/dt of 100 A/µs. 

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

## **Current Transducer LAH 25-NP** 

## **Isolation characteristics** 

**V** d Rms voltage for AC isolation test, 50/60 Hz, 1 mn 5 kV **V** w Impulse withstand voltage 1.2/50 µs 12 kV **V** e Partial discharge extinction voltage rms @ 10pC >2 kV Mini **dCp** Creepage distance[7)] 12 m m **dCl** Clearance distance[7)] 12 m m **CTI** Comparative Tracking Index  (Group I) 175 

## **Application examples** 

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

- Over voltage category OV 3 

- Pollution degree PD2 

- Non-uniform field 

|Over voltage category OV 3<br>• Pollution degree PD2<br>• Non-uniform field|Over voltage category OV 3||
|---|---|---|
||**EN 50178**|**IEC 61010-1**|
|dCp, dCI,|Rated isolation voltage|Nominal voltage|
|Single isolation|1000 V|1000 V|
|Reinforced isolation|500 V|500 V|



- Note: 7) On PCB with soldering pattern UTEC93-703. 

## **Safety** 

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 built-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. 

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

071008/7 

**==> picture [136 x 36] intentionally omitted <==**

**==> picture [33 x 33] intentionally omitted <==**

## **Dimensions  LAH 25-NP** (in mm. 1 mm = 0.0394 inch) 

**==> picture [438 x 307] intentionally omitted <==**

**----- Start of picture text -----**<br>
Connection<br>Bottom view<br>Left view<br>**----- End of picture text -----**<br>


## **Front view** 

**==> picture [511 x 168] intentionally omitted <==**

**----- Start of picture text -----**<br>
Number P r i m a r y  c u r r e n t N o m i n a l T u r n s P r i m a r y Primary insertion Recommended<br>of primary nominal    maximum output current r a t i o resistance i n d u c t a n c e  PCB c o n n e c t i o n s<br>t u r n s I PN    [ A ]      I P     [ A ] I SN         [ mA ]      K N R P      [ mΩ ] L P                  [ µH ]<br>3 2 1 IN<br>1 25 55 25 1 : 1000 0.18 0.012<br>OUT 4 5 6<br>3 2 1 IN<br>2 12 27 24 2 : 1000 0.81 0.054<br>OUT 4 5 6<br>3 2 1 IN<br>3 8 18 24 3 : 1000 1.62 0.110<br>OUT 4 5 6<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- General tolerance 

- General tolerance ± 0.2 mm 

- • Fastening & connection of primary 6 pins 1 x 0.8 mm Recommended PCB hole 1.5 mm 

- • Fastening & connection of secondary 3 pins 0.7 x 0.6 mm Recommended PCB hole 1.2 mm 

## **Remarks** 

- **I** S is positive when **I** P flows from terminals 1, 2, 3 (IN) to terminals 6, 5, 4 (OUT). 

- The jumper temperature and PCB should not  exceed 100°C. 

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

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



## Links

- [View this product on Novapart](https://novapart.co/products/LAH%2025-NP/current-transducer-lah-series-25a-55a-to-03-closed)
- [Request a quote for this part](https://novapart.co/quote/)
- [Supplier page](https://es.farnell.com/lem/lah-25-np/current-transducer-25a-pcb/dp/2146849)
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