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Hot Products

LDSR 0.3-NP , LDSR0.3-NP

HOT OFFER// Authorized Distributor
  • MacroQuest Part#LDSR 0.3-NP
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $24.85 - $35.71
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    1-9 Pieces $35.71
    10-99 Pieces $27.14
    >=100 Pieces $24.85
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    Description FAQ Review
    Description

    LEM LDSR 0.3-NP LDSR-NP Series Closed-Loop Leakage Current Sensor


    0.3A Rated Current x ±0.9A Measuring Range — High-Accuracy Leakage Detection for Photovoltaic Inverters

     

    LEM LDSR 0.3-NP Product Overview

    The LDSR 0.3-NP is a closed-loop Hall effect current transducer from LEM's LDSR-NP series, designed for the electronic measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits. This PCB-mount sensor is specifically tailored for earth leakage current measurement in transformerless photovoltaic inverters for the residential market, as well as for single-phase and three-phase systems. The device features a voltage output and operates from a single +5 V supply, simplifying system integration.

    Rated for 0.3 A nominal with a ±0.9 A measuring range, it outputs a ratiometric voltage of 2.5 V ± 0.666 V with 2% accuracy at +25°C. Linearity is ±3% and sensitivity is 2.2 V/A. Response time is 300 µs and bandwidth is DC to 2 kHz. Supply voltage is +5 V (4.75 to 5.25 V). Mass is 38 g and operating temperature is -40°C to +105°C. Insulation test voltage is 1.71 kV with a creepage and clearance distance of 7.1 mm for high insulation.

     

    LEM LDSR 0.3-NP Key Specifications

    Parameter

    Value

    Rated current (IPN)

    0.3 A

    Measuring range (IPM)

    0 … ±0.9 A

    Output signal (VOUT)

    2.5 V ± 0.666 V (ratiometric)

    Sensitivity

    2.2 V/A

    Supply voltage (VC)

    4.75 … 5.25 V

    Accuracy (XG)

    2% (+25°C)

    Linearity (EL)

    ±3%

    Response time (tr)

    300 µs

    Bandwidth (BW)

    DC … 2 kHz

    Insulation test voltage (Vd)

    1.71 kV

    Creepage and clearance

    7.1 mm

    Operating temp (TA)

    -40°C … +105°C

    Mass (m)

    38 g

    Mounting

    PCB through-hole

     

    LEM LDSR 0.3-NP Key Advantages

    The LDSR 0.3-NP employs closed-loop Hall effect technology with a proprietary ASIC, delivering reliable and precise current measurements with 2% accuracy while maintaining a low offset drift. The ±0.9 A range provides ample headroom for detecting leakage currents up to 0.3 A nominal, while the 300 µs response time and 2 kHz bandwidth capture DC and AC residual currents effectively. The PCB-mount design with through-hole terminals enables direct integration onto circuit boards. The 7.1 mm creepage and clearance distances ensure high insulation for safety in high-voltage systems. The reference access pin provides flexible signal adaptation, and the device includes an existing test winding and demagnetization function for ease of use.

     

    LEM LDSR 0.3-NP Typical Applications

    Renewable energy systems
    Leakage current measurement in transformerless PV inverters
    Failure detection in power sources
    Symmetrical fault detection
    Current leakage detection in stacked DC sources
    Single or three phase residual current monitoring

     

    Why Choose the LEM LDSR 0.3-NP?

    The LDSR 0.3-NP combines a 0.3 A nominal rating with a ±0.9 A measuring range and 2% accuracy in a compact, PCB-mount package designed specifically for renewable energy applications. Manufactured by LEM, it delivers stable, accurate, and safe current measurement for critical leakage detection systems. The closed-loop Hall effect design offers excellent linearity, low thermal drift, and high immunity to external interference, making it a reliable choice for photovoltaic inverters and power source monitoring where measurement integrity and safety are paramount. The device is covered by LEM's 5-year guarantee and conforms to industry standards for insulation and safety.

     

    FAQ
    Q
    What is the advantage of MacroQuest?
    A
    Our advantage is that we not only low prices, but we more suited to you.
    Our Keywords is
    New and original parts
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    Q: I want to work with MacroQuest because of high quality. But I found your price too high and out of line with the prevailing market level, how should I do?
    A: MacroQuest has been devoted to offer a best price to our customers,if you want to buy it at a cheapper price. Please contact us directly to see if we can negotiate  a cheaper price rate. Or, send us an email with your T/P.
    Simon Hsu
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    Alice Wang
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    Q：Are all the parts new and original?
    -A:Yes, all parts are new and original checked by our quality control department.

    Q：How long is your warranty?
    -A:We offer a 1 year warranty for form fit and function for MacroQuest stock. 


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    Apr 25, 2026
    Good and reliable, several deals over many years without any problem.
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