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Closed loop (compensated) current transducer using the Hall effect
| Primary Current, Measuring Range | −150 ... 150 A |
| Output Voltage Range | 0.25 ... 4.75 V |
| Supply Voltage | 4.75 ... 5.25 V |
| Operating Temperature Range | −40 ... 105 °C |
| Isolation Test Voltage | 4.3 kV |
| Primary Nominal RMS Current (IPN) | 50 A |
AC variable speed 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, Solar inverters.
The LESR 50-NP/SP1 is a closed loop (compensated) current transducer from LEM for the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation.
Typical applications include AC variable speed 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 ... 0.1 % of IPN; frequency bandwidth 300 ... 1 kHz; operating temperature −40 ... 105 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LESR |
| Product Reference | LESR 50-NP/SP1 |
| Primary Nominal Current | 50 A |
| Supply Voltage | 4.75 ... 5.25 V |
| Measurement | current: DC, AC, pulsed... |
| Mounting | PCB Mount |
| Application Domain | Industrial |
| Electrical Data — LESR 50-NP/SP1 | |
|---|---|
| Primary Nominal RMS Current (IPN) | 50 A |
| Primary Current, Measuring Range (IPM) | −150 ... 150 A |
| Supply Voltage (UC) | 4.75 ... 5.25 V |
| Current Consumption (IC) | 18 ... 1600 mA (typ 20.5 mA) |
| Accuracy & Dynamic Performance | |
|---|---|
| Linearity Error (εL) | −0.1 ... 0.1 % of IPN |
| Electrical Offset Voltage (VO E) @ IP = 0 | 0.875 mV |
| Response Time to 90 % of IPN Step | 0.4 µs |
| Frequency Bandwidth | 300 ... 1 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 4.3 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 8 kV |
| Creepage Distance (dCp) | 7.55 mm |
| Clearance (dCI) | 7.55 mm |
| Comparative Tracking Index (CTI) | 600 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 ... 105 °C |
| Ambient Storage Temperature (TA st) | −55 ... 125 °C |
| Mass (m) | 10 g |
| Standards & Certifications | |
|---|---|
| IEC 61800 | -1: |
| IEC 61800 | -2: |
| IEC 61800 | -3: |
| IEC 61800 | -5-1: |
| IEC 62109 | -1: |
| IEC 62477 | -1: |
| UL 508 | 2013. |
Note: Specifications are taken from the official LESR 50-NP/SP1 datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LESR 50-NP/SP1.
Outline dimensions, pin layout and connection diagrams of the LESR 50-NP/SP1 are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 10 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LESR 50-NP/SP1.
The characteristic curves of the LESR 50-NP/SP1 from the official datasheet are shown below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Linearity Error (εL) | −0.1 ... 0.1 % of IPN |
| Response Time to 90 % of IPN Step | 0.4 µs |
| Frequency Bandwidth | 300 ... 1 kHz |
Note: Refer to the datasheet for the complete set of characteristic curves.
Other models of the LES Series share the same measurement principle, mounting concept and output interface family.
