Surge protection and interference filters

Effective protection

Effective protection

Do you want system operation to be unaffected by interference? Then surge protection is an essential requirement.

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  • Set solutions
    Set solutions

    Set solutions, for buildings or photovoltaic systems, provide comprehensive protection against damage caused by surge voltages.

  • Test device for surge protective devices
    Test device for surge protective devices

    The portable test device checks all the relevant components of pluggable surge protective devices.

  • Lightning current measuring
    Lightning monitoring

    The lightning monitoring system acquires and analyzes lighting surge currents. Maintenance can therefore be planned optimally.

  • Interference filters
    Interference filters

    Interference filters limit unwanted voltage peaks and smooth the voltage signal.

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High-frequency, low-energy interference can be smoothed and eliminated using interference filters. Meanwhile lightning and surge protective devices provide protection against transient and high-energy voltage peaks.

Your advantages

  • Protection for all common applications and signals, thanks to the complete product portfolio
  • Versatile fields of application – designs and connection methods for every application
  • Space-saving and inexpensive installation, thanks to slim design
  • Easy testing, thanks to plug-in arresters
  • Protection against transient and high-frequency voltages with combinations of interference filters and surge protection

The protective circuit principle

The protective circuit provides seamless protection against surge voltages.  

The protective circuit against surge voltages

An "effective protective circuit" helps to implement seamless surge protection.

And this is how it works:

Draw an imaginary circle around the object you want to protect.

Surge protective devices must be installed at all points where cables intersect this circle.

The area within the protective circuit is therefore protected in such a way that conducted surge voltages are prevented.

Consider the following areas during planning:

  • Power supply
  • Measurement and control technology
  • Data processing, telecommunications
  • Transceiver devices


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Configure products and solutions for your individual application.

Surge protection and interference filters

Surge protection for MCR technology

The complete product range starting from an overall width of just 3.5 mm.

Surge protection for MCR technology from Phoenix Contact
Surge protection for MCR technology

Surge protection technology

Find out about the basics, applications, and standards.

Surge protection technology
Find out more

NFPA 79 (2018)

Ensure that your machinery is ready for the new Edition 2018

NFPA 79 (2018)
More information

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