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Hot Products

LV 25-400 , LV25-400

HOT OFFER// Authorized Distributor
  • MacroQuest Part#LV 25-400
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $110.29 - $126.23
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    3-5 Pieces $114.64
    >=6 Pieces $110.29
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    Description FAQ Review
    Description

    LV25-400 Closed-Loop Hall-Effect Voltage Transducer


    LV25-400 Precision Voltage Measurement Solution

    In applications such as industrial automation, power supply systems, and motor drives, the accuracy and reliability of voltage measurement directly determine overall system performance. The LV25-400 closed-loop Hall-effect voltage transducer from LEM – a global leader in current and voltage measurement – provides precise, safe electronic measurement of DC, AC, and pulsed voltages, with full electrical isolation between the primary high-voltage circuit and the secondary electronic circuit.

     

    LV25-400 Key Highlights

    The LV25-400 offers the following key advantages, helping engineers and purchasing professionals quickly understand why it is the right choice:

    Excellent Measurement Accuracy – Total error as low as ±0.8%, linearity error less than 0.2%, outstanding for high-precision measurement applications.

    Reliable Electrical Isolation – Full galvanic isolation between primary and secondary, with an isolation test voltage of 4.1 kV and a UL 94-V0 rated plastic case for safe operation in high-voltage environments.

    Excellent Immunity to Interference – High immunity to electromagnetic interference, thanks to closed-loop Hall-effect technology that delivers clean, stable measurement signals even in noisy environments.

    Very Low Temperature Drift – Maintains outstanding stability over a wide -25°C to +70°C temperature range, suitable for harsh industrial conditions.

    Compact PCB-Mount Design – Integrated primary resistor, mounted on a 128×60 mm PCB, compact and easy for system integration.


    LV25-400 Technical Specifications at a Glance

    Parameter

    Value

    Primary nominal voltage (VPN)

    400 V

    Primary voltage measuring range (UPM)

    0 ~ ±600 V

    Primary nominal current (IPN)

    10 mA

    Secondary nominal current (ISN)

    25 mA

    Supply voltage (UC)

    ±12 V ~ ±15 V (±5%)

    Conversion ratio

    400 V : 25 mA

    Measuring resistance (RM) range

    30~200 Ω / 100~180 Ω

    Total accuracy error (εtot)

    ±0.8%

    Linearity error (εL)

    < 0.2%

    Response time (tD90)

    < 15 μs

    Primary internal resistance (RP) @25°C

    40 kΩ

    Operating temperature range (TA)

    -25°C ~ +70°C

    Storage temperature range (TS)

    -40°C ~ +85°C

    Isolation test voltage (Vd)

    4.1 kV

    Weight

    approx. 60 g

    Case material

    UL 94-V0 insulating plastic


    LV25-400 Main Applications

    The LV25-400 is widely used in industrial power conversion and motor control applications, including but not limited to:

    AC variable speed drives & servo motor drives – Provides accurate bus voltage feedback in inverters and servo drives, ensuring stable voltage control for motors and improving dynamic response.

    DC motor drive electrostatic converters – Supplies voltage sampling for DC speed control systems, enhancing safety and stability.

    Uninterruptible power supplies (UPS) – Real-time input/output voltage monitoring in UPS systems, safeguarding power quality and transfer reliability for critical loads.

    Welding machine power supplies – Voltage detection in welding equipment, meeting high dynamic response and noise immunity requirements.

    Battery management systems & test/measurement equipment – Acts as a precision voltage sampling element in BMS and industrial test devices.

    These proven industrial applications confirm the reliability and versatility of the LV25-400.

     

    Why Choose the LV25-400?

    Reliable performance, guaranteed data – ±0.8% total accuracy combined with <0.2% linearity delivers high-quality voltage data for your system.

    Strong environmental adaptability – Operating temperature range from -25°C to +70°C, readily handling various industrial site conditions.

    Convenient installation and maintenance – PCB plug-in design optimizes board space and reduces extra connectors and cabling costs.

    Full technical support – As a world-leading brand in voltage and current measurement, LEM provides comprehensive documentation and engineering support, simplifying selection and use.

     

    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
    Fast Delivery
    Instock & available
    Short Leadtime
    30-Days returns
    ISO9001 Certification
    1 Year Warranty 

    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.

    Q: How to Request a Quote?
    -A:You have three ways to request a quote:
    1.Choose an item using a search box or browsing through product categories.Click on "Request Quote" button on the Product page.
    2.Click here for feedback on our web.
    3.If you have a BOM list or want to email us directly, please contact:
    Simon Hsu
    simon@mymacroquest.com
    Alice Wang
    alice@mymacroquest.com

    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. 


    Q:  Can I use Credit Card/Debit Card payment for my orders on your website?
    -A:Yes, you can. you can pay on our company via Credit Card/Debit Card（Mastercard, Discover, Visa, American EXpress, Diners).

    Please select the first payment method-Paypal, then you will see Credit Card/Debit Card payment button in the lower right corner.



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    Review
    Kenyatta
    Feb 11, 2026
    The transportation is very good, the quality is also very good, I will buy again.
    Garnett
    Feb 07, 2026
    We have done several orders and all come in prisitine condition as stated.
    Dixie
    Nov 21, 2025
    received good quality products in time...
    Francisca
    Nov 13, 2025
    Very fast shipping will be ordering again.
    Platt
    Sep 04, 2025
    Excellent Seller and Products.Very Satisfied
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