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Closed loop (compensated)
| Conversion Ratio (KN) | 1 : 2000 |
| Secondary Nominal RMS Current (ISN) | 50 mA |
| Response Time to 90 % of IPN Step | < 1 µs |
| Isolation Test Voltage (50 Hz, 1 min) | 3.52 kV |
| Impulse Withstand Voltage (1.2/50 µs) | 6.5 kV |
| Operating Temperature Range | - 10 .. + 70 °C |
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 LT 108-S7 is a closed loop (compensated) current transducer from LEM for the electronic measurement of currents: DC, AC, pulsed....
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: total error ± 0.6 %; linearity error < 0.1 %.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LT |
| Product Reference | LT 108-S7 |
| Primary Nominal Current | 100 A |
| Supply Voltage | ± 12 .. 15 V |
| Measurement | currents: DC, AC, pulsed... |
| Mounting | Busbar Mount |
| Application Domain | Industrial |
| Electrical Data — LT 108-S7 | |
|---|---|
| Primary Nominal RMS Current (IPN) | 100 A |
| Primary Current, Measuring Range (IPM) | 0 .. ± 150 A |
| Secondary Nominal RMS Current (ISN) | 50 mA |
| Conversion Ratio (KN) | 1 : 2000 |
| Supply Voltage (UC) | ± 12 .. 15 V |
| Current Consumption (IC) | 28 (@ ± 12 V) + IS mA |
| Accuracy & Dynamic Performance | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.6 % |
| Linearity Error (εL) | < 0.1 % |
| Offset Current @ IP = 0, TA = 25 °C (IO) | ± 0.15 mA |
| Magnetic/Residual Offset Current (IOM) | ± 0.10 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 (-3 dB) (BW) | DC .. 100 kHz |
| Total Error (εtot) @ IPN, TA = 25 °C | ± 0.6 % |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 3.52 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 6.5 kV |
| Creepage Distance (dCp) | 10 mm |
| Clearance (dCI) | 6 mm |
| Comparative Tracking Index (CTI) | 275 |
| Rated Insulation Voltage (basic) | 600 V |
| Overvoltage Category / Pollution Degree | Over voltage category OV 3 · Pollution degree PD 2 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | - 10 .. + 70 °C |
| Ambient Storage Temperature (TA st) | - 25 .. + 80 °C |
| Secondary Coil Resistance @ TA = 70 °C (RS) | 32 Ω |
| Mass (m) | 73 g |
| Standards & Certifications | |
|---|---|
| EN 50178 | Compliance |
| IEC 61010-1 | Compliance |
Note: Specifications are taken from the official LT 108-S7 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LT 108-S7.
Outline dimensions, pin layout and connection diagrams of the LT 108-S7 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 73 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LT 108-S7.
Characteristic curve diagrams are not included in the LT 108-S7 datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Overall Accuracy @ IPN, TA = 25 °C (XG) | ± 0.6 % |
| Linearity Error (εL) | < 0.1 % |
| Response Time to 90 % of IPN Step (tr) | < 1 µs |
| di/dt Accurately Followed | > 100 A/µs |
| Frequency Bandwidth (-3 dB) (BW) | DC .. 100 kHz |
| Total Error (εtot) @ IPN, TA = 25 °C | ± 0.6 % |
Note: For the full set of performance data, refer to the datasheet.
Other models of the LT Series share the same measurement principle, mounting concept and output interface family.
