Interference filters

Reliable signals

Reliable signals

Benefit from a consistent interference-free power supply in your company.

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Devices that are used for data processing and automation benefit particularly from a clean power supply. Take preventive action: interference filters limit conducted, high-frequency interference voltages. This results in safer operation and reliable measured results.

Your advantages

  • Protection against pulse-like and high-frequency voltages – using filters with integrated surge protection
  • Large number of fields of application due to various different attenuation curves
  • Flexible designs – can be used in control cabinets and at the workplace
  • Compact protection using symmetrical and asymmetrical filter circuit

Interference filters with type 3 surge protection

Interference filters with surge protection  

Interference filters with surge protection product series

Interference filters with integrated type 3 surge protection have two tasks: they absorb transient surge voltages and also limit high-frequency interference voltages.

Interference filters with surge protection are available in various different designs:


SFP-TRAB DIN rail module

  • Floating remote indication contact
  • Optical status indicator
  • DIN-rail mountable
  • 120 V versions as well, for potentially explosive areas

TERMITRAB modular terminal block

  • With spring-cage connection
  • Protection for two conductors with common reference potential
  • For 24 V power systems
  • DIN-rail mountable

Interference filters

Interference filter/radio interference suppression capacitor  

Interference filters and radio interference suppression capacitors for mounting on DIN rails.

Products with integrated filter circuits can be considered as dedicated interference filters. They protect against both symmetrical and asymmetrical interference.

  • FILTRAB: designed for a maximum nominal current of 1 to 10 A – depending on the type – and can be mounted on DIN rails.

If asymmetrical protection is sufficient, modular terminal blocks with integrated radio interference suppression capacitor are suitable.


Unit 15C, 906-930 Great South Road, Penrose
Auckland 1061
New Zealand

Phone: 0508 474 636
Toll Free (Local)
09 950 8495


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Surge protection and interference filters


Filter technology

Learning module on filter technology.