Single-phase EMI (Electromagnetic Interference) filters are electrical components used to reduce or eliminate electromagnetic interference generated by electronic devices or systems. EMI filters are crucial in ensuring that electronic equipment complies with electromagnetic compatibility (EMC) standards and regulations, which are designed to prevent interference between different electronic devices and systems.
Premier Filters-Commercial/Industrial Single Phase EMI Power Line Filters are specified for voltages to 300VAC and currents to 60A.
Please contact us at +1(657)226–0091 or at to discuss your project and filtering needs.
For different termination styles (E.G. QD, Connector, etc.) and Y-Cap values, consult Factory.

  1. Purpose:Single-phase EMI filters are primarily used to suppress electromagnetic interference generated by or affecting single-phase electrical systems. They are commonly found in a wide range of applications, including power supplies, inverters, home appliances, and electronic equipment.
  2. Filtering Mechanism: EMI filters work by providing a path for unwanted electromagnetic noise or interference to be absorbed or attenuated. They typically consist of passive components such as capacitors, inductors, and resistors. These components are arranged in a way that forms a low-pass filter, allowing the passage of power frequencies (e.g., 50Hz or 60Hz AC) while blocking or attenuating higher-frequency EMI signals from 150Khz to 30MHz or from 10Khz to 40 GHz.
  3. Types of EMI Filters:
  • Common Mode Filters: These filters target common mode interference, which occurs when unwanted signals appear in phase on both the line and neutral conductors. Common mode filters are effective at suppressing noise that appears equally on both conductors.
  • Differential Mode Filters: These filters address differential mode interference, which occurs when unwanted signals appear out of phase on the line and neutral conductors. Differential mode filters are effective at attenuating noise that appears on one conductor relative to the other.
  1. Applications:Single-phase EMI filters are commonly used in electronic devices and systems to meet EMC requirements and ensure reliable operation. They are essential in applications where electromagnetic interference can disrupt signal integrity, cause malfunctions, or violate regulatory compliance.


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