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Hot Products

ATO-125-B333-D16/SP1

HOT OFFER// Authorized Distributor
  • MacroQuest Part#ATO-125-B333-D16/SP1
  • ManufacturerLEM
  • Standard Lead TimeNA
  • Part StatusActive
    • $34.29 - $58.69
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    600-1199 Pieces $38.57
    >=1200 Pieces $34.29
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    Description FAQ Review
    Description

    LEM ATO-125-B333-D16/SP1 ATO Series Split-Core Current Transformer


    125A Rated Current x 333mV Voltage Output — Class 1 Accuracy for Smart Grid and Energy Metering

     

    LEM ATO-125-B333-D16/SP1 Product Overview

    The ATO-125-B333-D16/SP1 is a split-core AC current transformer from LEM's ATO Series, designed for the non-invasive electronic measurement of AC waveforms with galvanic isolation between the primary circuit and the secondary measurement circuit. This 125 A nominal version features a 333 mV voltage output at rated current and a 16 mm sensing aperture, enabling installation on insulated conductors without service interruption.

    Rated for 125 A nominal with a 125 A measuring range, it outputs 333 mV with 1% accuracy (IEC 61869-2 Class 1) and <0.1% linearity. Bandwidth is 1.5 kHz. Supply voltage is self-powered. Mass is approximately 120 g and operating temperature is -10 °C to +55 °C. Insulation test voltage is 4300 V with application up to 600 V CAT III PD2, basic insulation.

     

    LEM ATO-125-B333-D16/SP1 Key Specifications

    Parameter

    Value

    Rated current (IPN)

    125 A

    Measuring range (IPM)

    125 A

    Output signal (ISN)

    333 mV

    Turns ratio

    1:1000

    Supply voltage (VC)

    Self-powered

    Accuracy (XG)

    Class 1 (IEC 61869-2)

    Linearity (EL)

    <0.1%

    Response time (tr)

    <1 s

    Bandwidth (BW)

    1.5 kHz

    Insulation (Vd)

    4300 V / 600 V CAT III PD2

    Aperture

    16 mm

    Operating temp (TA)

    -10 °C to +55 °C

    Mass (m)

    ~120 g

    Mounting

    Chassis / Panel (optional DIN rail adapter)

    Termination

    1 m cable leads

     

    LEM ATO-125-B333-D16/SP1 Key Advantages

    The ATO-125-B333-D16/SP1 employs air-core technology, delivering Class 1 accuracy and <0.1% linearity while providing galvanic isolation between primary and secondary circuits. The 125 A range provides direct measurement capability up to the full nominal current, while the self-powered design eliminates the need for external power supplies and simplifies installation. The 16 mm aperture accommodates standard industrial conductors and the split-core design with plastic tie slot enables quick, non-intrusive installation without disconnecting cables. The 4300 V insulation ensures safe operation in distribution panels with basic insulation protection.

     

    LEM ATO-125-B333-D16/SP1 Typical Applications

    Hybrid inverters for home energy storage systems
    Power metering and sub-metering for energy efficiency monitoring and consumption analysis
    Building sub-metering for cost allocation and energy audits
    Power quality monitoring for electrical loads and distribution system equipment
    Distributed measurement systems in smart grid infrastructure
    Condition monitoring for motor loads such as conveyors and pumps

     

    Why Choose the LEM ATO-125-B333-D16/SP1?

    The ATO-125-B333-D16/SP1 combines 125 A nominal capacity with 333 mV voltage output and IEC 61869-2 Class 1 accuracy in a compact split-core package with self-powered operation. Manufactured by LEM, it delivers stable, accurate, and safe AC current measurement for industrial and smart grid applications. The 1 m output cable with wire leads simplifies integration, and the optional DIN rail adapter offers flexible mounting options. This model offers a cost-effective solution for non-invasive current monitoring where voltage output is preferred over current output, making it ideal for direct connection to PLCs, energy meters, and data acquisition systems.

     

    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
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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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    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. 


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    Less
    Review
    Fulton
    Apr 17, 2026
    super fast delivery and excellent goods!
    Sophia
    Nov 11, 2025
    The logistics are quite fast. The quality is good.
    Janetta
    Oct 24, 2025
    We've purchased from them several times
    Zenia
    Mar 24, 2025
    Perfect Partner
    Nina
    Aug 21, 2023
    I am quite satisfied to buy this part from Macroquest.
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