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Hot Products

APR 400 B420L , APR400B420L

Second. Nominal Signal[DC TRMS:Current 4-20mA]
  • MacroQuest Part#APR 400 B420L
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $117.42 - $125.46
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    Description FAQ Review
    Description

    LEM APR 400 B420L APR Series Split Core Current Transducer

    LEM APR 400 B420L Product Overview

    The APR 400 B420L is a split-core current transducer from LEM's APR Series, designed for the electronic measurement of distorted AC waveforms with galvanic isolation between the primary and secondary circuits . This True RMS transducer features a loop-powered 4-20mA output and incorporates PRiME (Rogowski) air-core technology for accurate measurement of non-sinusoidal waveforms .

    Rated for 200 A, 300 A, or 400 A nominal via switch selection, it outputs a DC 4-20 mA signal with ±1% accuracy and ±0.5% linearity . Response time is typically less than 150 ms and bandwidth is 30 Hz to 6 kHz . Supply voltage is 12 to 24 V DC loop-powered . Mass is 90 g and operating temperature ranges from -20°C to +60°C . Insulation test voltage is 5 kV RMS at 50 Hz for 1 minute . The 18 mm diameter aperture accommodates standard cables and eliminates insertion loss .

     

    LEM APR 400 B420L Key Specifications

    Parameter

    Value

    Rated current (IPN)

    200 A, 300 A, 400 A (switch selectable)

    Measuring range (IPM)

    400 A

    Output signal

    DC True RMS 4-20 mA

    Supply voltage (VC)

    12 to 24 V DC loop-powered

    Accuracy (X)

    ±1 %

    Linearity (εL)

    ±0.5 %

    Response time (tr)

    < 150 ms (typical)

    Bandwidth (BW)

    30 Hz to 6 kHz

    Insulation (Vd)

    5 kV RMS / 50 Hz / 1 min

    Aperture

    18 mm

    Operating temp (TA)

    -20°C to +60°C

    Mass (m)

    90 g

    Mounting

    Panel or DIN rail mounting

     

    LEM APR 400 B420L Key Advantages

    The APR 400 B420L employs PRiME Rogowski air-core technology, delivering True RMS measurement for accurate monitoring of distorted AC waveforms typical in VFD and SCR applications . The split core construction with 18 mm aperture enables fast, non-intrusive installation without disconnecting existing cables . The switch-selectable 200 A, 300 A, and 400 A ranges offer application flexibility without requiring multiple transducers . The loop-powered 4-20 mA output simplifies wiring and integrates seamlessly with PLCs and control systems . The 5 kV RMS insulation and UL94-V0 recognized insulating plastic case ensure safe operation and protection for downstream equipment .

     

    LEM APR 400 B420L Typical Applications

    VFD controlled loads: output current monitoring to indicate motor and attached load operating conditions 
    SCR controlled loads: accurate measurement of phase-angle fired or burst fired SCR systems 
    Switching power supplies and electronic ballasts: True RMS sensing for precise input power measurement 
    Automation and process control applications 
    Smart grid and energy management systems 
    Panel meters for power consumption display
    Data loggers requiring loop-powered transducers
    Motor current monitoring and protection

     

    Why Choose the LEM APR 400 B420L?

    The APR 400 B420L combines switch-selectable 200 A, 300 A, and 400 A current ranges with a loop-powered True RMS 4-20 mA output in a compact split core package. Manufactured by LEM, it delivers stable, accurate, and safe AC current measurement for demanding energy and automation applications . The split core design offers easy installation without system interruption, while the PRiME Rogowski technology provides accurate measurement of distorted AC waveforms found in modern variable speed drives and power electronics .

     

    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
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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
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    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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    Feb 11, 2026
    Elsa is a solid supplier. I have done business with them for at least the past 4-5 years. Always good product.
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    Nov 05, 2025
    the Parts are delivered super fast, carefully packaged, and trustworthy!
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