LA 305-S

## **Current Transducer LA 305-S** 

## **I = 300 A** PN 

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

COM 16173 LANT 

## **Electrical data** 

|**I**PN|Primary nominal current rms|||300||||A|
|---|---|---|---|---|---|---|---|---|
|**I**PM|Primary current, measuring range|Primary current, measuring range||0 .. ± 500||||A|
||||**T**A= 70°C|||**T**A= 85°C|||
|**R**M|Measuring resistance||**R**M min**R**M max|||M max**R**M min|M min**R**M max|M max|
||with ± 12 V<br>@ ± 300 Amax||0|52||0|50|50<br>Ω|
||@ ± 500 Amax||0|17||0|15|15<br>Ω|
||with ± 15 V<br>@ ± 300 Amax||0|75||5|73|73<br>Ω|
||@ ± 500 Amax||0|31||5|29|29<br>Ω|
|**I**SN|Secondary nominal current rms|Secondary nominal current rms||120||||mA|
|**K**N|Conversion ratio|||1 : 2500|||||
|**V**C|Supply  voltage (± 5 %)|||± 12 .. 15|± 12 .. 15|||V|
|**I**C|Current consumption|||20(@ ± 15 V) +|||(@ ± 15 V) +**I**SmA|mA|
|**Accuracy - Dynamic performance data**|||||||||
|**X**G|Overall accuracy @**I**PN,**T**A= 25°C|||± 0.8|± 0.8|± 0.8||%|
|εL|Linearity error|||< 0.1|< 0.1|< 0.1||%|
|||||Typ||Max|||
|**I**O<br>**I**OM|Offset current @**I**P= 0,**T**A= 25°C<br>Magnetic offset current1)@**I**P= 0 and specified|= 25°C<br>= 0 and specified|= 0 and specified**R**M,|||± 0.20|± 0.20|mA<br>mA|
||after an overload of 3 x||after an overload of 3 x**I**PN|||± 0.40|± 0.40|mA|
|**I**OT|Temperature variation of**I**O|- 10°C .. + 85°C||± 0.12 ± 0.30|± 0.12 ± 0.30|± 0.12 ± 0.30|± 0.12 ± 0.30|mA|
|**t**ra|Reaction time @ 10 % of**I**PN|||< 500|< 500|< 500||ns|
|**t**r|Response time2)@ 90 % of**I**PNstep|||< 1||||µs|
|**di/dt**|di/dt accurately followed|||> 100|> 100|> 100|A/µs||
|**BW**|Frequency bandwidth (- 3 dB)|||DC .. 100||||kHz|
|**General data**|||||||||
|**T**A|Ambient operating temperature|||- 10 .. + 85||||°C|
|**T**S|Ambient storage temperature|||- 40 .. + 90||||°C|
|**R**S|Secondary coil resistance|@**T**A= 70°C||35||||Ω|
|||@**T**A= 85°C||37||||Ω|
|**_m_**|Mass|||200||||g|
||Standards|||EN 50178: 1997|||||



## **Features** 

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

- ●Isolated 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) The result of the coercive force (Hc) of the magnetic circuit 

2) 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. 

110203/9 

## **Current Transducer LA 305-S** 

|**Isolation characteristics**|**Isolation characteristics**|||
|---|---|---|---|
|**V**d|Rms voltage for AC isolation test, 50 Hz, 1 min|6|kV|
|**V**w|Impulse withstand voltage 1.2/50 µs|20|kV|
|||Min||
|**dCp**|Creepage distance|27|mm|
|**dCI**|Clearance distance|26.5|mm|
|**CTI**|Comparative Tracking Index (group IIIa)|225||



## **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**|
|---|---|---|
|**dCp**,**dCI**,<br>**V**w|Rated insulation voltage|Nominal voltage|
|Single insulation|2500 V|2500 V|
|Reinforced insulation|1250 V|1250 V|



According VDE 0160 (1994): single insulation 3500 V Reinforced insulation 1750 V 

## **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 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. 

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

110203/9 

## **Dimensions LA 305-S** (in mm) 

## **Connection** 

## **Mechanical characteristics** 

- ●General tolerance 

●General tolerance ± 0.5 mm ●Transducer fastening 2 holes Ø 5.5 mm 2 M5 steel screws Recommended fastening torque 4 Nm ●Primary through-hole 25.5 x 25.5 mm ●Connection of secondary MOLEX 5046 4 pins tin plated 

## **Remarks** 

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

- ●Temperature of the primary conductor should not exceed 100°C. 

- ●Dynamic performances (di/dt and response time) are best with a single bar completely filling the primary hole. 

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

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www.lem.com 

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

110203/9