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Hot Products

CTSR0.3-TP/SP17,CTSR 0.3-TP/SP17

HOT OFFER// Authorized Distributor
  • MacroQuest Part#CTSR0.3-TP/SP17
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $31.42 - $46.82
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    10-99 Pieces $42.85
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    Description FAQ Review
    Description

    LEM CTSR 0.3-TP/SP17 Closed-Loop Fluxgate Current Sensor

     

    LEM CTSR 0.3-TP/SP17 Product Overview

    The CTSR 0.3-TP/SP17 is a closed-loop Fluxgate current sensor from LEM's CTSR series, designed for non-contact, compact, and accurate milliamps measurement of DC, AC, and pulsed currents with galvanic isolation between the primary and secondary circuits.

    This sensor is specifically designed for residual and leakage current measurement, with a nominal current of 0.3A and a measuring range of 0.45A. It outputs a voltage signal (2.5V ± 1.4856V) with 1.5% accuracy. The SP17 suffix indicates a specific configuration version with integrated primary conductors (TP variant).

    The CTSR series utilizes closed-loop Fluxgate technology, ensuring high accuracy and very low offset drift over temperature, making it particularly suitable for industrial applications.

     

    LEM CTSR 0.3-TP/SP17 Key Technical Specifications

    Parameter

    Specification

    Model

    CTSR 0.3-TP/SP17

    Series

    CTSR

    Measurement Technology

    Closed-loop Fluxgate

    Nominal Current

    0.3 A RMS

    Measuring Range

    0.45 A

    Output Signal

    2.5V ± 1.4856V instantaneous voltage

    Accuracy

    1.5 %

    Supply Voltage

    5V DC (unipolar)

    Operating Temperature

    -40℃ ~ +105℃

    Aperture Size

    20.1 mm

    Mounting Type

    PCB Mount

    Reference Pin

    Ref In / Ref Out modes for ADC reference temperature drift cancellation

    Degauss Function

    Built-in

    Test Function

    Built-in

    Standards Compliance

    VDE 0126-1-1, UL 1741

    Product Status

    Active

     

    LEM CTSR 0.3-TP/SP17 Core Advantages

    Closed-Loop Fluxgate Technology: Delivers high accuracy (1.5%) and very low offset drift over temperature, essential for reliable residual current detection

    Non-Contact & Compact: The 20.1mm aperture allows for non-invasive measurement. The compact PCB-mount design saves board space

    Single-Supply Voltage Output: Simplifies design with a direct 2.5V ± 1.4856V voltage output, eliminating the need for a bipolar supply and simplifying ADC interfacing

    0.3A Nominal Current with 0.45A Range: Specifically designed for measuring very small currents in the milliampere range with high precision

    Reference Pin for Temperature Drift Cancellation: Additional pin allows connection to the internal voltage reference or an external reference (2.3V to 4V), enabling cancellation of reference temperature drift

    Degauss and Test Functions: Built-in degaussing and testing capabilities ensure consistent, accurate measurements over time

    High Insulation Capability: Features high creepage and clearance distances for robust electrical isolation and safety

    Wide Operating Temperature Range: -40℃ to +105℃ ensures reliable performance across diverse environmental conditions

     

    Why Choose the CTSR 0.3-TP/SP17?

    Customer Pain Point

    CTSR 0.3-TP/SP17 Solution

    Need to measure very small currents (mA range) with high precision

    High accuracy (1.5%) with a 0.45A measuring range in a closed-loop system

    Installing a sensor without disrupting the primary circuit

    Non-contact 20.1mm aperture for easy, non-invasive installation

    Limited space on the PCB

    Compact PCB-mount design

    Accuracy drift due to temperature changes

    Very low offset drift over the -40°C to +105°C temperature range

    Leakage current detection in photovoltaic inverters

    Specifically designed for VDE 0126-1-1 and UL 1741 standards

     

    LEM CTSR 0.3-TP/SP17 Target Applications

    Residual Current Measurement (Leakage detection)

    Leakage Current Measurement in Transformerless PV Inverters

    Symmetrical Fault Detection (e.g., in motor inverters)

    Failure Detection in Power Sources

    Leakage Current Detection in Stacked DC Sources

    Uninterruptible Power Supplies (UPS)

    Switch Mode Power Supplies

     

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    What is the advantage of MacroQuest?
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    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.
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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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    Upton
    Mar 24, 2026
    Everything is very professional. hope can do more in the future.
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    Jan 30, 2026
    The supplier's service is very good, and we can do business in the future
    Omaira
    Sep 24, 2025
    Professionals
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    Aug 12, 2025
    Very good quality. It's well packed. Very good and fast service. Very satisfied.
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    Aug 14, 2022
    Quality product
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