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Closed loop (compensated)
| Primary Current, Measuring Range | 0 .. ± 500 A |
| Secondary Nominal Current | 0.15 A |
| Supply Voltage | ±11.4 .. ±21 V |
| Operating Temperature Range | −40 … 85 °C |
| Isolation Test Voltage | 3.8 kV |
| Primary Nominal RMS Current (IPN) | 300 A |
Windmill inverters, Test and measurement, Substations, AC variable speed and servo motor drives, Statics converters for DC motors drives, Battery supplied applications, Uninterruptible Power Supplies (UPS), Switched Mode Power Supplies (SMPS), Power supplies for welding applications.
The LF 310-S is a closed loop (compensated) current transducer from LEM for the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation.
Typical applications include Windmill inverters, Test and measurement, Substations and AC variable speed and servo motor drives.
Key characteristics from the official datasheet: total error ± 0.2 % (25 … 85 °C) / ± 0.2 % (−40 … 85 °C); linearity error ± 0.05 %; frequency bandwidth 100 kHz; operating temperature −40 … 85 °C; nominal secondary output 0.15 A.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LF |
| Product Reference | LF 310-S |
| Primary Nominal Current | 300 A |
| Supply Voltage | ±11.4 .. ±21 V |
| Measurement | current: DC, AC, pulsed... |
| Mounting | Panel Mount |
| Application Domain | Industrial |
| Electrical Data — LF 310-S | |
|---|---|
| Primary Nominal RMS Current (IPN) | 300 A |
| Primary Current, Measuring Range (IPM) | 0 .. ± 500 A |
| Secondary Nominal RMS Current (ISN) | 0.15 A |
| Turns Ratio (NP/NS) | 1 : 2000 |
| Supply Voltage (UC) | ±11.4 .. ±21 V |
| Current Consumption (IC) | 33 + IS mA @ ±UC = ±12 V / 35 + IS mA @ ±UC = ±15 V / 38 + IS mA @ ±UC = ±20 V |
| Resistance of Secondary Winding (RS) | 22.5 Ohm |
| Accuracy & Dynamic Performance | |
|---|---|
| Total Error (εtot) @ IPN | ± 0.2 % (25 … 85 °C) / ± 0.2 % (−40 … 85 °C) |
| Linearity Error (εL) | ± 0.05 % |
| Electrical Offset Current (IO) | ± 0.2 A |
| Magnetic Offset Current (IO M) | ± 0.2 A |
| Frequency Bandwidth (BW) | 100 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 3.8 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 10 kV |
| Creepage Distance (dCp) | 10.8 mm |
| Clearance (dCI) | 10.5 mm |
| Comparative Tracking Index (CTI) | 600 |
| Rated Insulation Voltage (basic) | 1000 V |
| Rated Insulation Voltage (reinforced) | 600 V |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 … 85 °C |
| Ambient Storage Temperature (TA st) | −50 … 90 °C |
| Mass (m) | 107 g |
| Case Material | V0 according to UL 94 |
| Standards & Certifications | |
|---|---|
| IEC 61010-1 | 2010 |
| IEC 61800-5-1 | 2007 |
| IEC 62109-1 | 2010 |
| UL 508 | 2013 |
Note: Specifications are taken from the official LF 310-S datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LF 310-S.
Outline dimensions, pin layout and connection diagrams of the LF 310-S are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 107 g |
| Resistance of Secondary Winding (RS) | 22.5 Ohm |
| Case Material | V0 according to UL 94 |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LF 310-S.
The characteristic curves of the LF 310-S from the official datasheet are shown below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Total Error (εtot) @ IPN | ± 0.2 % (25 … 85 °C) / ± 0.2 % (−40 … 85 °C) |
| Linearity Error (εL) | ± 0.05 % |
| Frequency Bandwidth (BW) | 100 kHz |
Note: Refer to the datasheet for the complete set of characteristic curves.
Other models of the LF Series share the same measurement principle, mounting concept and output interface family.
