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Hot Products

CTSR 0.3-P , CTSR0.3-P

Second. Nominal Signal[Instantaneous:Voltage 2.5 +/- 1.2 V]
  • MacroQuest Part#CTSR 0.3-P
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
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    Description FAQ Review
    Description

    CTSR 0.3-P Leakage Current Sensor | High-precision mA-Level Detection, Safe Guarding Every Moment

     

    CTSR 0.3-P Key Technical Highlights

    Closed-loop Fluxgate Technology – Precision as a Pursuit
    The CTSR 0.3-P uses LEM’s unique closed-loop fluxgate technology, achieving an accuracy of up to ±1.9% at +25°C and linearity of ±0.5%. Compared with Hall effect sensors, fluxgate technology offers higher resolution and lower zero drift. This gives the CTSR 0.3-P a decisive advantage in small-current detection – even in the presence of thousands of amperes of high-current interference, it accurately identifies milliampere-level leakage anomalies.

    Extremely Low Temperature Drift – Stable Protection Around the Clock
    Over a wide operating temperature range from -40°C to +105°C, the CTSR 0.3-P maintains ultra-low offset drift, requiring no frequent calibration – truly “install once, worry-free for long.”

    High Insulation & Strong Overload Protection
    A creepage distance and clearance of 11 mm provide robust electrical isolation between the primary and secondary circuits, ensuring a high safety level. Overload capability reaches 3300 A (100-second pulse). Whether due to grid fluctuations or sudden short circuits, the sensor remains rock-solid.

    Smart Reference Pin & Self-Test Function
    The CTSR 0.3-P is equipped with flexible reference pins (Ref In/Ref Out), allowing access to an internal voltage reference or connection to an external ADC reference – eliminating temperature drift of the reference voltage and improving measurement consistency. It also features degaussing and test functions, effectively removing residual magnetism and facilitating production testing and system self-diagnosis, ensuring long-term stable operation.

     

    CTSR 0.3-P Key Specifications at a Glance

    Parameter

    Value

    Nominal measuring current

    300 mA

    Measuring range

    –500 mA to +500 mA (AC/DC bidirectional)

    Supply voltage

    4.75 V to 5.25 V

    Accuracy (+25°C)

    ±1.9%

    Linearity

    ±0.5%

    Response time

    50 µs

    Frequency bandwidth

    DC to 3.5 kHz

    Operating temperature

    –40°C to +105°C

    Creepage / clearance

    11 mm

    Overload capability

    3300 A (100 s pulse)

    Mounting type

    PCB through-hole

    Primary hole diameter

    20.1 mm

    Weight

    approx. 28 g

     

    CTSR 0.3-P Typical Applications

    Renewable Energy – Indispensable Safety Guardian
    In transformerless PV inverters, the CTSR 0.3-P accurately detects leakage current, meeting the latest safety standards (VDE 0126-1-1, UL 1741, etc.) and enabling first-touch protection for photovoltaic arrays – a safety net for plant operators and maintenance personnel.

    Industrial Power & Motor Drive Systems – “Safety Inspector”
    Real-time monitoring of symmetry faults and leakage currents in medium-power inverter supplies and motor drive systems provides 24/7 leakage protection, preventing equipment damage and unplanned production downtime.

    Precision Equipment & Appliances – Leakage Protector
    Provides high-precision mA-level leakage monitoring for UPS, medical equipment, EV chargers, and more – a professional “small package” that safeguards the lifeblood of your entire system.

    Why Choose the CTSR 0.3-P?

    You don’t have to choose between safety and precision. The LEM CTSR 0.3-P combines high accuracy, high insulation, wide temperature & frequency range, and intelligent flexibility – building a solid safety barrier for every one of your “electricity-related” projects. Whether for PV inverters, industrial power supplies, or on-board chargers, choosing the CTSR 0.3-P means choosing the industry benchmark and peace of mind.

     

    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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    Short Leadtime
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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
    simon@mymacroquest.com
    Alice Wang
    alice@mymacroquest.com

    Q: Can MacroQuest offer NET terms?
    A: Yes we can. Please contact with your sales manager for more information.

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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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    Mar 04, 2026
    Very fast shipping will be ordering again.
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    Jun 14, 2023
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    May 28, 2023
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