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Hot Products

LF 310-S , LF310-S

HOT OFFER// Authorized Distributor
  • MacroQuest Part#LF 310-S
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $52.56 - $61.18
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    60-119 Pieces $56.25
    >=120 Pieces $52.56
    Quantity:
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    Description FAQ Review
    Description

    LEM LF 310-S Closed-Loop Hall Effect Current Sensor

     

    LF 310-S Product Overview

    The LF 310-S is a high-precision current sensor based on closed-loop Hall effect technology, from LEM (Switzerland), the global leader in electrical measurement. Featuring patented ASIC technology, its performance approaches that of expensive fluxgate sensors while maintaining the cost advantage of closed-loop Hall effect sensors.

    The sensor operates on a ±12V to ±20V bipolar supply, with a rated current of 300A, a measuring range of ±500A, and a 150mA current output. It features a 20mm aperture, an operating temperature range of -40°C to +85°C, and complies with EN 50178, IEC 61010-1, and UL 508 international standards.

     

    LF 310-S Key Technical Specifications

    Parameter

    Specification

    Rated Current

    300 A

    Measuring Range

    ±500 A

    Output Signal

    150 mA

    Technology

    Closed-loop Hall Effect (ASIC)

    Accuracy @ 25°C

    ±0.2%

    Full-Temperature Accuracy

    ±0.25%

    Linearity

    < ±0.05%

    Zero Drift

    < 0.2 A (0.1% IPN)

    Response Time

    < 0.5 µs

    Bandwidth

    DC ~ 100 kHz

    Supply Voltage

    ±12V ~ ±20V

    Insulation Test Voltage

    4.4 kV / 1 minute

    Operating Temperature

    -40℃ ~ +85℃

    Aperture

    20 mm

    Weight

    107 g

     

    LF 310-S Key Advantages

    ASIC Closed-Loop Technology: Performance approaching fluxgate sensors, double the full-temperature accuracy, zero drift of only 0.1% IPN — overcomes fluxgate noise and delay issues at a more competitive price

    <0.5µs Ultra-Fast Response: Several times faster than traditional Hall sensors, perfectly matched for high-frequency IGBT/PWM switching applications, providing timely triggering for overcurrent protection

    ±0.2% High Accuracy + 0.05% Linearity: Closed-loop compensation eliminates core saturation, ensuring measurement accuracy even with large DC offsets

    Superior Noise Immunity: Significantly better external magnetic field rejection than the previous generation — stable operation in complex industrial EMI environments such as VFDs and high-power drives

    -40℃~+85℃ Wide Temperature + Multiple Certifications: Covers applications from cold outdoor to high-temperature industrial environments, compliant with EN 50178, IEC 61010-1, and UL 508

    150mA Current Output: Excellent noise immunity, long transmission distance, high signal-to-noise ratio

    20mm Aperture + Flexible Mounting: Easy busbar passage, compact design fits various industrial cabinet layouts

    Target Applications

    AC variable frequency drives, servo drives, UPS systems, battery management systems, switch-mode power supplies, renewable energy inverters, DC motor drives, welding power supplies.

     

    Why Choose the LF 310-S?

    Comparison Aspect

    LF 310-S

    Traditional Closed-Loop Hall

    Fluxgate

    Accuracy

    ±0.2%

    ±0.5% ~ ±0.8%

    ±0.1% ~ ±0.2%

    Zero Drift

    0.1% IPN

    0.3% ~ 0.5% IPN

    <0.1% IPN

    Response Speed

    <0.5µs

    1µs ~ 3µs

    1µs ~ 5µs

    Price

    Hall-effect price

    Lower

    Expensive

     

    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.

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    -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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    Less
    Review
    Edith
    Mar 03, 2026
    Looking forward to doing more business with you!
    Xenia
    Nov 08, 2025
    The part is original.
    Benediz
    Jul 26, 2025
    Simon is good about giving conditions of his parts and works hard to meet my target prices. We've done some big deals together with no problems.
    Star
    Dec 06, 2023
    super to deal with Alice!
    Primrose
    Apr 06, 2023
    Worth recommending!
     12 
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