Common Mode Choke Coil

Common mode electromagnetic noise is conducted simultaneously on all lines (supply and ground) in the same direction. But it is also coupling back to ground.

Common mode chokes help to capture this unwanted noise and prevent it from being transmitted and coupling back to ground. High impedance at the unwanted frequencies helps to eliminate the unwanted noise.

This is done by capturing the line and neutral signal currents and burning it off as heat through a common device such as a magnetic core.

In a common mode choke, both line and neutral windings are wound on a single core.
Designing filters with common mode chokes is an economic way to combine low losses, low voltage drop, minimal signal impact with efficient EMC/EMI filtering.

  • Voltage Range

    250 VAC / 440VAC / 690VAC

  • Current Range

    0.5A to 32A @40°C

  • Application

    Test & measurement equipment

  • Operating Frequency


  • Mounting

    Vertical / Horizontal

Product Specification


  • Compact and Cost Effective
  • Rated Current up to 32A
  • Coil with Different foot Print.
  • Excellent Common Mode Suppression.


  • Power Systems – Signal lines, UPS/Inverters, Fuel Cells, Chargers
  • Industrial equipment – VFD / Stepper motor drives, HVAC, Elevators, Welding units
  • Test and measurement equipment
  • Medical – MRI rooms, scanners, diagnostic equipment
  • Military applications – Radar, Satellite systems

What EMIS Offers

EMIS range of Common mode Choke coils are designed for use in a wide range of applications. The choke coils are very effective in suppressing common mode noise, providing high impedance without saturation.

  • Compact and cost effective
  • Rated Current up to 32A
  • Coil with different foot print options
  • Horizontal and vertical mounting options