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Current transformers

Haug's cutting-edge current transformers for high-precision current measurement feature core materials with the highest permeability and linearity. 

What are current transformers?

The current is the switching, control or monitoring variable in electrical devices and systems. Current transformers are used for this current measurement, which record currents that are sometimes up to 1000A high. These are converted into small values ​​of a few mA using the transformation ratio. One of the main applications is in the low-frequency range with 16.7Hz (railway frequency), 50/60Hz (mains frequency in households) and 400Hz (on-board power supply, e.g. in aviation). The second important application field is in the high frequency range from 20kHz ... 500kHz. Here the currents in switching power supplies / power supplies (SNT) / switch mode power supply (SPS) are measured.

What is haug's service in the field of current transformers?

We have a large product portfolio in the low-frequency range from 16.7Hz to 400Hz as well as in the higher-frequency range from 20kHz to 500kHz. One focus is in the frequency range of 50/60Hz for the household sector, for measuring or billing electricity in household meters or the e-charging stations / e-filling stations. The components are available with a push-through opening or with an integrated current clip. A customer-specific solution can be designed on request.

Areas of application of current transformers

The areas of application are wherever measurement and control or monitoring and/or control is required.


  • Switching Power Supplies (SMPS)
  • Converters for drives
  • PV inverter
  • EV charging stations
  • Battery chargers
  • Inverters for welding machines
  • Uninterruptible Power Supplies (UPS)
  • Telecom Power Supplies.

Advantages of current transformers

The current transformers are very robust and reliable components. They can be used in an operating temperature from -55°C to 130°C. They are almost immune to interference and show no aging effects in the measurement characteristics.