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Closed loop (compensated)
| Primary Current, Measuring Range | −900 ... 900 mA |
| Supply Voltage | 4.75 ... 5.25 V |
| Operating Temperature Range | −40 ... 105 °C |
| Isolation Test Voltage | 1.71 kV |
| Primary Nominal RMS Current (IPN) | 300 mA |
| Current Consumption (IC) | 18 ... 20.5 mA |
Leakage current measurement in transformerless PV inverters, 3 phases plus neutral, First human contact protection of PV arrays, Failure detection in power sources, Symmetrical fault detection, Current leakage detection in stacked DC sources, Single phase nominal current measurement up to ±30 A per wire (DC or AC).
The LDSR 0.3-NP is a closed loop (compensated) current transducer from LEM for the electronic measurement of current: DC, AC, pulsed..., with galvanic isolation.
Typical applications include Leakage current measurement in transformerless PV inverters, 3 phases plus neutral, First human contact protection of PV arrays and Failure detection in power sources.
Key characteristics from the official datasheet: linearity error −3 ... 3 % of IPRM; frequency bandwidth 2 kHz; operating temperature −40 ... 105 °C.
| General Information | |
|---|---|
| Manufacturer | LEM |
| Product Series | LDSR |
| Product Reference | LDSR 0.3-NP |
| Primary Nominal Current | 300 mA |
| Supply Voltage | 4.75 ... 5.25 V |
| Measurement | current: DC, AC, pulsed... |
| Mounting | PCB Mount |
| Application Domain | Industrial |
| Electrical Data — LDSR 0.3-NP | |
|---|---|
| Primary Nominal RMS Current (IPN) | 300 mA |
| Primary Current, Measuring Range (IPM) | −900 ... 900 mA |
| Supply Voltage (UC) | 4.75 ... 5.25 V |
| Current Consumption (IC) | 18 ... 20.5 mA |
| Accuracy & Dynamic Performance | |
|---|---|
| Linearity Error (εL) | −3 ... 3 % of IPRM |
| Response Time to 90 % of IPN Step | 300 µs |
| Frequency Bandwidth | 2 kHz |
| Insulation Coordination | |
|---|---|
| RMS Voltage for AC Insulation Test (50 Hz, 1 min) Ud | 1.71 kV |
| Impulse Withstand Voltage (1.2/50 µs) UNi | 4 kV |
| Comparative Tracking Index (CTI) | 600 |
| Environmental & Mechanical Characteristics | |
|---|---|
| Ambient Operating Temperature (TA) | −40 ... 105 °C |
| Ambient Storage Temperature (TA st) | −50 ... 105 °C |
| Mass (m) | 38 g |
| Standards & Certifications | |
|---|---|
| EN 61800 | -1: |
| EN 61800 | -2: |
| EN 61800 | -3: |
| UL 62109 | -1: |
| IEC 61010 | -1: |
| UL 508 | . |
Note: Specifications are taken from the official LDSR 0.3-NP datasheet. Parameters that could not be confirmed from the datasheet are marked UNVERIFIED.
Official technical documentation for the LDSR 0.3-NP.
Outline dimensions, pin layout and connection diagrams of the LDSR 0.3-NP are shown below.
| Outline Dimensions & Mechanical Data | |
|---|---|
| Mass | 38 g |
Note: All dimensions are in millimetres. Refer to the official datasheet for the complete dimension drawing.
Typical applications of the LDSR 0.3-NP.
Characteristic curve diagrams are not included in the LDSR 0.3-NP datasheet; the relevant characteristics are the accuracy and dynamic performance data listed below.
| Accuracy & Dynamic Characteristics | |
|---|---|
| Linearity Error (εL) | −3 ... 3 % of IPRM |
| Response Time to 90 % of IPN Step | 300 µs |
| Frequency Bandwidth | 2 kHz |
Note: For the full set of performance data, refer to the datasheet.
Other models of the LDSR Series share the same measurement principle, mounting concept and output interface family.
