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    20A 3-phase EMI Line Filter, 2 Stage

    5 out of 5 based on 1 reviews | Write a review
    3-phase 3-wire EMI line filter in dual-stage configuration, current rating 20A, voltage rating 250/440V AC 50/60Hz, high performance, compact design, great EMI filter for servo system, motor drives, etc.
    SKU: ATO-EMI-2020
    Free Shipping Worldwide
    Delivery date: 15-30 days

    20A dual-stage EMI power line filter for 3-phase 3-wire power system, features compact, easy to install and excellent performance, which is widely used in servo system, automation equipment and machine tools, including 3 phase motor drives, printing equipment, packaging equipment, textile equipment, industrial air conditioners, UPS, communication equipment, etc.


    Model ATO-MT720-20
    Configuration Dual Stage
    Rated Current @ 40℃ 20A
    Rated Voltage 250/440V AC
    Operating Frequency 50/60Hz
    Phase Three Phase Three Wire
    Leakage Current ≤10mA @ 250V AC 50Hz 20℃
    Filter Range 150KHz-30MHz
    Hipot Rating (one minute) Line to Line 1450V DC
    Line to Ground 2250V DC
    Climatic Category 25/085/21
    Working Tempearte -25°C~+85°C
    Output Termainal Threaded stud
    Weight 1kg
    Dimension See below

    Dimensions (Unit: mm)

    20A 3-phase EMI Line Filter Dimension

    Electrical Schematic

    3-phase 2-stage Power Line Filter Electrical Schematic

    Tips: Band pass filter vs. band stop filter

    1. Definition & performance

    • Band pass filter: allows certain frequency band signal to pass through, and restrains lower or higher than the certain frequency band signal, interference and noise.
    • Band stop filter: restrains certain frequency band signal and allows signals outside the certain frequency band to pass through.

    2. Working principle

    A perfect band pass filter should has a complete flat pass band without amplification or attenuation in the pass band, and all frequency outside pass band would be attenuated completely. Besides, the conversion outside pass band will be completed within very small frequency range. Actually, no perfect band pass filter existed. Filter can’t attenuate all frequency outside the expected frequency range completely, especially outside the requested pass band there is an attenuated but not insulated range. This is usually called filter roll down phenomenon, and expressed with attenuation fluctuation dB value of every 10 times frequency. Usually, filter design would try to guarantee roll down range as narrow as possible, in the case filter performance will get closer to design. But, with the roll down range getting smaller, pass band will no longer flat, starting to appear “ripple”. This phenomenon is obvious at pass band edge, which is called Gibbs phenomenon. Band stop filter can pass most frequency component, attenuating the certain range frequency component to extremely low level. It’s opposite with band pass filter definition. Among them, notch filter is a special band stop filter, whose stop band range is very small, and has very high Q factor.

    Existing reviews of 20A 3-phase EMI Line Filter, 2 Stage
    The line filter arrived in a timely manner.
    The line filter arrived in a timely manner and I’m using it now. I cut down line noise for the drive from other devices. It appears to be effective and the device seems to run more smoothly.
    From: Shane | Date: 25/01/2019
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