Feedthrough Capacitors

The easiest way of preventing EMI is to enclose the electrical equipment (if possible) in a metal case. This is popularly known as 'Faraday Cage' and is good at minimizing Radiated Interference (RMI). Additionally, most electrical and electronic systems need a sequence of Inductor-Capacitor (LC) filters to remove EMI. These filters are called as Feed-through (FT) capacitors and FT filters.

FEEDTHROUGH CAPACITORS: A Feed-through terminal that provides the desired value of capacitance between the conductor and the metal chassis through which the conductor is passing. This capacitor is primarily used for bypass purposes in high frequency circuits.

Performance characteristics:

  • Provides filtering in high frequency ranges (> 1 GHz)
  • Can provide EMI protection in standard, high and extended performance ranges
  • 10 – 300 A, 130 V DC / 250 V AC
  • FT capacitor performance increases with higher frequency, thus providing better cost benefit
  • FT filters can be used when higher performance is required over broad range of frequencies
  • FT filters have better performance than FT capacitors when the noise source impedance is less than 50 Ohms

Applications of FT Capacitors:

  • Home appliances
  • Telecom Systems - Base Station Racks, Routers, Broadband Communications
  • Medical Systems - MRI Rooms, Screened rooms
  • Power Systems - Main Power Supplies, Power Amplifiers and generators, high current SMPS
  • Industrial Systems - High Frequency welding equipment, Rolling Mills, Variable Speed Drives, Frequency converters, Electric drives. Industrial controls
  • Military Systems - Military vehicles and equipment
  • Office Automation
  • Non-Conventional Energy

Why EMIS?

  • EMIS feed-through components support a wide range of current ratings, capacitance, thread sizes and mounting options
  • Components are compact in size, have high contact reliability and are easy to install
  • EMIS filters are available in voltage ratings of 110/230/440/520/680 VAC & with current rating up to 2500Amps
  • EMIS developed Military grade Chamber filters with >80dB suppression from 14KHz to 30GHz. Filters rated for 400Hz AC applications are also covered in this range. These products are under safety certification.
  • EMIS filters have International Safety Certification as per CSA/C-US /NEMKO. EMIS is the only brand manufactured in India with this Certification.
  • EMIS is associated with Indian Military R&D in developing and certifying HEMP filters rated up to 1500amps in 3ph AC as per MIL 188-125.
  • EMIS has developed Power line feed through Capacitors & feed through filters Up to 600 Amps for 250V AC application. These are approved by both Indian & international customers and are available as filter plates. These products are under safety certification.
  • Custom built feed-through components are available at customer request.
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  • Voltage Range

    250VAC/600VDC

  • Current Range

    5A – 100A

  • Application

    Shielded rooms

  • Voltage Range

    250VAC/600VDC

  • Current Range

    5A – 100A

  • Application

    Telephone exchanges, base stations

  • Voltage Range

    250VAC/600VDC

  • Current Range

    1A – 30A

  • Application

    Shielded rooms