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Closed loop (compensated) current transducer using the Hall effect
| Primary Current, Measuring Range | 0 .. ± 500 A |
| Conversion Ratio (KN) | 1 : 2000 |
| Secondary Nominal RMS Current (ISN) | 150 mA |
| Response Time to 90 % of IPN Step | < 1 µs |
| Isolation Test Voltage (50 Hz, 1 min) | 6 kV |
| Impulse Withstand Voltage (1.2/50 µs) | > 7.3 kV |
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.
The LF 306-S/SP10 is a closed loop (compensated) current transducer from LEM for the electronic measurement of currents: DC, AC, pulsed..., with galvanic isolation.
It offers excellent accuracy, very good linearity, low temperature drift and wide frequency bandwidth. Typical applications include AC variable speed drives and servo motor drives, Static converters for DC motor drives, Battery supplied applications and Uninterruptible Power Supplies (UPS).
Key characteristics from the official datasheet: linearity error < 0.1 %; frequency bandwidth DC .. 100 kHz; operating temperature - 25 .. + 70 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LF |
| Product Reference | LF 306-S/SP10 |
| Primary Nominal Current | 300 A |
| Supply Voltage | ± 12 .. 15 V |
| Measurement | currents: DC, AC, pulsed... |
| Mounting | PCB Mount |
| Application Domain | Industrial |
| Electrical Data — LF 306-S/SP10 | |
|---|---|
| Primary Nominal RMS Current (IPN) | 300 A |
| Primary Current, Measuring Range (IPM) | 0 .. ± 500 A |
| Secondary Nominal RMS Current (ISN) | 150 mA |
| Conversion Ratio (KN) | 1 : 2000 |
| Supply Voltage (UC) | ± 12 .. 15 V |
| Current Consumption (IC) | 20 (@ ± 15V) + IS mA |
| Accuracy & Dynamic Performance | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.4 % |
| Linearity Error (εL) | < 0.1 % |
| Offset Current @ IP = 0, TA = 25 °C (IO) | ± 0.20 mA |
| Magnetic/Residual Offset Current (IOM) | ± 0.08 mA |
| Temperature Variation of IO (Max) | ± 0.64 mA |
| Reaction Time @ 10 % of IPN (tra) | < 500 ns |
| Response Time to 90 % of IPN Step (tr) | < 1 µs |
| di/dt Accurately Followed | > 100 A/µs |
| Frequency Bandwidth (-1 dB) (BW) | DC .. 100 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 6 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | > 7.3 kV |
| Creepage Distance (dCp) | 7.8 mm |
| Clearance (dCI) | 7.1 mm |
| Comparative Tracking Index (CTI) | 175 |
| Overvoltage Category / Pollution Degree | Over voltage category OV · Pollution degree PD2 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | - 25 .. + 70 °C |
| Ambient Storage Temperature (TA st) | - 40 .. + 90 °C |
| Secondary Coil Resistance @ TA = 70 °C (RS) | 34 Ω |
| Mass (m) | 60 g |
| Recommended PCB Hole | 1.1 mm |
| Standards & Certifications | |
|---|---|
| EN 50178 | Compliance |
Note: Specifications are taken from the official LF 306-S/SP10 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LF 306-S/SP10.
Outline dimensions, pin layout and connection diagrams of the LF 306-S/SP10 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Recommended PCB Hole | 1.1 mm |
| Mass | 60 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LF 306-S/SP10.
Characteristic curve diagrams are not included in the LF 306-S/SP10 datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.4 % |
| Linearity Error (εL) | < 0.1 % |
| Response Time to 90 % of IPN Step (tr) | < 1 µs |
| di/dt Accurately Followed | > 100 A/µs |
| Frequency Bandwidth (-1 dB) (BW) | DC .. 100 kHz |
Note: For the full set of performance data, refer to the datasheet.
Other models of the LF Series share the same measurement principle, mounting concept and output interface family.
