Why Do We Need a Power Line Filter and Where to Place It?

Currently, it is almost impossible to meet the requirements of the EMC standards. Schurter EMC components will help you with this.

Why Do We Need a Power Line Filter and Where to Place It?

Schurter offer wide range of EMC components:

  • Power entry modules with filter for currents 0.5 to 20A.
  • EMC filters (1-phase, 3-phase AC and DC).
    The smallest one, 1-phase, 6A/250VAC FMLB-09, 5500.2031 has dimension 50x45x28,6mm and weight 116g.
    One of the biggest ones is 3-phase, 1100A/520VAC FMAC-0974-K152I with dimensions 590x230x200mm and weight 47kg.
  • Current compensated chokes (1-phase and 3-phase) for currents 0.4 to 50A.


    The majority power entry modules features V-Lock locking system. The power connector is equipped with a pin that interlocks with a notch in the power entry module and thus reliably prevents the cord from being pulled out unintentionally.

    You can find more information about all Schurter EMC components in PEM, filter and chokes overviews.

    Why do we need a power line filter?

    Currently, electronic equipment typically use switching-mode power supply and fast digital circuit. Such devices generate high-frequency voltages and currents during normal operation. Without the power line filter, it is almost impossible to meet the requirements of the EMC standards.

    The two primary functions of the power line filter are:

    • Preventing high-frequency signals within the device from reaching the input power line.
    • Preventing high-frequency signals distribution system (disturbance) from entering the equipment.   

    Why Do We Need a Power Line Filter and Where to Place It?

    Currently, information technology equipment (ITE) has to fulfil the requirements of EN55032 emission standard and EN55035 immunity standard.

    EN55032 defines limits for conducted disturbance at mains terminals in frequency range 150kHz to 30MHz and radiated disturbance in range 30MHz to 1GHz. 

    Schurter power line filters are optimized for frequency range 150kHz to 30MHz where they provide the best attenuation but simultaneously, they have also around 20dB attenuation at 400MHz, which helps decrease the radiation from antenna created by power cord. 

    Conducted emission regulations are intended to control the radiation from the public AC power distribution system, which results from high frequency currents conducted back onto the power line. Normally, these currents are too small to cause interference to other products connected to the same power line, however, they are large enough to cause power line to radiate and possibly become a source of interference, for example to AM radio. (For example, EN 55032 requires conducted disturbance from Class A devices ≤ 60dBuV = 1mV in the frequency range 500kHz to 30MHz.) 

    Power-line filter also efficiently attenuates continuous RF disturbances during the test according to EN 55035 §4.2.2.3, where 3V RMS RF signal in range 150kHz to 10MHz, 3 to 1V in range 10MHz to 30MHz and 1V in range 30MHz to 80MHz is injected into power line.

    In combination with surge protection, filter also helps to pass tests according to EN 55035 §4.2.4 – electrical fast transient and EN 55035 §4.2.5-surges.

    Where to place a power line filter?

    The filter efficiency is equally, if not more dependent on how and where it is mounted, and how the leads are routed to the filter than on the electrical design of the filter. The figure below shows three common problems associated with the mounting of a power-line filter, which significantly decrease its effectiveness.

    Why Do We Need a Power Line Filter and Where to Place It?
    1.The filter is not mounted close to the point where the power line enters the enclosure. The exposed power line (antenna) can pick up noise from electric and magnetic fields inside the enclosure.

    2. The wire grounding the filter to the enclosure has large inductance, which decreases the effectiveness of the Y-capacitors in the filter.
    The manufacturer assembles Y-capacitors so that the connection with the cover has minimal inductance.

    Why Do We Need a Power Line Filter and Where to Place It?

    3.Capacitive coupling occurs between the noisy power-supply-to-filter wiring and the ac power line.

    Next figure shows properly mounted power-line filter.

    Why Do We Need a Power Line Filter and Where to Place It?

    The filter is mounted where the AC power line enters the enclosure to prevent electromagnetic field coupling to the filtered power line. The metal enclosure now also blocks any capacitive coupling from the filter input cable and the filtered power line. 

    The filter is mounted in a way that the filter’s metal case makes direct contact with the device enclosure, which eliminates any additional inductance in series with the internal Y-capacitors. Any wire between the filter’s case and the enclosure decreases the effectiveness of the filter as a result of its inductance. 

    The wires between the filter and the power supply should be routed close to the enclosure to minimize any pickup. Do not route the filter’s input leads close to output DC power leads, as this will maximize the parasitic capacitance coupling. Input leads should also be kept away from any signal cables (especially digital cables) and should not be routed over, or near, a digital logic PCB.

    An additional improvement over the arrangement shown above is mounting the power supply close to the power line filter.

    The above fact points out the advantages of power-line filter having an integral AC power cord connector.

    Why Do We Need a Power Line Filter and Where to Place It?

    Why Do We Need a Power Line Filter and Where to Place It?

    Why Do We Need a Power Line Filter and Where to Place It?

    This configuration forces the filter to be mounted where the power cord enters the enclosure and where the filter’s metal flange is screwed or riveted to the enclosure (on an unpainted, conductive surface) so the Y-capacitors will be properly grounded. 


    Are you interested in more information on Schurter products or technical advice when choosing a product?
    Or do you have another question or request? Please fill out the following form, we will be happy to help you.

    * Data marked with an asterisk (*) are required.

    Do not miss these articles

    Do you like our articles? Do not miss any of them! You do not have to worry about anything, we will arrange delivery to you.

    Related articles

    Main products


    5500.2027 SCHURTER  
    5500.2027

    Power Line Filter 250VAC 2A Chassis Mount

    Power Line Filters

    Ord. No.: 104919
    Manufacturer: SCHURTER
    in stock 134 pcs
    1 pcs+
    2 pcs+
    10 pcs+
    40 pcs+
    10,40 €
    9,66 €
    8,71 €
    8,11 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    5220.0643.1 SCHURTER  
    5220.0643.1

    Appliance Inlet with Line Filter 250VAC 6A Chassis Mount

    Power Line Filters

    Ord. No.: 72443
    Manufacturer: SCHURTER
    in stock 64 pcs
    1 pcs+
    10 pcs+
    20 pcs+
    17,30 €
    15,20 €
    14,80 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    5500.0655.1 SCHURTER  
    5500.0655.1

    Power Line Filter 250VAC 6A PCB

    Power Line Filters

    Ord. No.: 114265
    Manufacturer: SCHURTER
    in stock 200 pcs
    1 pcs+
    2 pcs+
    5 pcs+
    30 pcs+
    12,20 €
    11,80 €
    11,10 €
    10,00 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    5500.2033 SCHURTER  
    5500.2033

    Power Line Filter 250VAC 16A Chassis Mount

    Power Line Filters

    Ord. No.: 104947
    Manufacturer: SCHURTER
    in stock 126 pcs
    (04/05/2024: 20 pcs)
    1 pcs+
    5 pcs+
    20 pcs+
    19,33 €
    17,74 €
    16,16 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    FKH2-50-6/I-A (4304.4044) SCHURTER  
    FKH2-50-6/I-A (4304.4044)

    Appliance Inlet with Line Filter 250VAC 6A Chassis Mount

    Power Line Filters

    Ord. No.: 69999
    Manufacturer: SCHURTER
    in stock 5 pcs
    (06/07/2024: 20 pcs)
    1 pcs+
    2 pcs+
    14 pcs+
    25,50 €
    24,20 €
    21,70 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    FKI2-50-6/I-A (4304.4064) SCHURTER  
    FKI2-50-6/I-A (4304.4064)

    Appliance Inlet with Line Filter 250VAC 6A Chassis Mount

    Power Line Filters

    Ord. No.: 69998
    Manufacturer: SCHURTER
    in stock 70 pcs
    1 pcs+
    2 pcs+
    12 pcs+
    27,40 €
    26,10 €
    24,00 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare

    FKI2-50-6/I-A (4304.4064) SCHURTER  
    FKI2-50-6/I-A (4304.4064)

    Appliance Inlet with Line Filter 250VAC 6A Chassis Mount

    Power Line Filters

    Ord. No.: 69998
    Manufacturer: SCHURTER
    in stock 70 pcs
    1 pcs+
    2 pcs+
    12 pcs+
    27,40 €
    26,10 €
    24,00 €
    • ADD TO CART
    • Get Quote
    • Add to favorites
    • Add to watchdog
    • Add item to compare
    Do you agree with cookies being stored?
    Welcome to the SOS electronic website. Before you enter our online world, we would like to ask you to allow us to store cookies on your browser. Your consent will help us view the site without error, measure its performance, and track additional statistics. Apart from that, we can bring you an offer of our products and services, literally tailor-made. We also provide cookies to third parties. However, you are definitely safe with us.
    The proper operation of the website
    More stable technical control
    Better marketing offer

    More about cookies
    More about personal data processing

    Necessary Only selected Accept all cookies