LF 306-S

## **Current Transducer LF 306-S** 

## **I = 300 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). a 7) Oem Came ~~C €~~ CWA us COMPLIANT 16130 Anns 2002/95/EC 

## **Electrical data** 

## **Features** 

**I** PN Primary nominal r.m.s. current 300 A **I** P Primary current, measuring range 0 .. ± 500 A **R** M Measuring resistance **R** M min **R** M max with ± 12 V @ ± 300 A max 0 37 Ω @ ± 500 A max 0 8 Ω with ± 15 V @ ± 300 A max 10 56 Ω @ ± 500 A max 10 20 Ω **I** SN Secondary nominal r.m.s. current 150 mA **K** N Conversion ratio 1 : 2000 **V** C Supply  voltage (± 5 %) ± 12 .. 15 V **I** C Current consumption 20 (@ ± 15 V) + **I** S mA **Accuracy - Dynamic performance data X** G Overall accuracy @ **I** PN , **T** A = 25°C ± 0.4 % **ε** L Linearity error < 0.1 % Typ Max **I** O Offset current @ **I** P = 0, **T** A = 25°C ± 0.20 mA **I** OM Residual current[ 1) ] @ **I** P = 0, after an overload of 3 x **I** PN ± 0.08 mA **I** Thermal drift of **I** - 25°C .. + 70°C ± 0.20 ± 0.64 mA OT O **t** ra Reaction time @ 10 % of **I** P max < 500 ns **t** r Response time[ 2)] @ 90 % of **I** PN < 1 µs **di/dt** di/dt accurately followed > 100 A/µs **f** Frequency bandwidth (- 1 dB) DC .. 100 kHz **General data T** A Ambient operating temperature - 25 .. + 70 °C **T** S Ambient storage temperature - 40 .. + 90 °C **R** S Secondary coil resistance @ **T** A = 70°C 34 Ω **m** Mass 60 g Standards EN 50178 : 1997 

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

- 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. 

Notes : 1) The result of the coercive field 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 previous notice. 

LEM 

www .lem.com 

## **Current Transducer LF 306-S** 

## CT **Isolation characteristics** 

|**V**d|R.m.s. voltage for AC isolation test, 50/60 Hz, 1 mn|6|kV|
|---|---|---|---|
|**V**w|Impulse withstand voltage 1.2/50 µs|>7.3|kV|
|||Min||
|**dCp**|Creepage distance|8|m m|
|**dCl**|Clearance distance|7.15|m m|
|**CTI**|Comparative Tracking Index  (Group III a)|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 

|~~a~~|**EN 50178**<br>~~es~~|**IEC 61010-1**|
|---|---|---|
|dCp, dCI,<br>**VW**<br>~~a~~|Rated isolation voltage<br>~~es~~<br>~~es~~|Nominal voltage|
|Single isolation<br>~~a~~<br>~~es~~|600 V<br>~~es~~<br>~~es~~<br>~~es~~<br>~~es~~|600 V<br>~~es~~|
|Reinforced isolation<br>~~es~~|300 V<br>~~es~~<br>~~es~~<br>~~es~~|300 V<br>~~es~~|



## **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. 

070424/9 

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

LEM 

www .lem.com 

**==> picture [515 x 65] intentionally omitted <==**

## **Dimensions  LF 306-S** (in mm. 1 mm = 0.0394 inch) 

**==> picture [511 x 379] intentionally omitted <==**

**----- Start of picture text -----**<br>
Connection<br>Front view<br>Bottom view Right view<br>Rep. Clearance Creepage<br>A-B 7.15 mm 8.00 mm<br>Back view<br>**----- End of picture text -----**<br>


## **Mechanical characteristics** 

- General tolerance 

- Fastening transducer Flat position 

Recommended fastening torque Or 

Recommended fastening torque Vertical position 

Recommended fastening torque Or 

Recommended fastening torque 

- Primary through-hole 

- Connection of secondary 

± 0.5 mm 

2 holes ∅ 6.6 mm 2 M6 steel screws 4.2 Nm or 3.1 Lb.-Ft. 2 holes ∅ 2.25 mm 2 x PT KA25 screws 0.3 Nm or 0.22 Lb.-Ft. 2 holes ∅ 4.3 mm 2 M4 steel screws 3 Nm or 2.21 Lb. - Ft. 2 holes ∅ 2.25 mm 2 x PT KA25 screws 0.3 Nm or 0.22 Lb.-Ft. 25.5 x 25.5 mm Molex 5045-03/AG 

## **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...), 

070424/9 

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

LEM 

www .lem.com