Current sensors

Current sensors are electrical components capable of measuring current strength in cables and busbars, usually galvanically isolated (non-contact), by using the magnetic flux density generated by the electrical currents.

Sensors are differentiated between those for alternating current measurement, and those for both direct and alternating current measurement.

The following are examples from a range of many other available current sensor products.

HF sensors

20 A current sensors are specially designed for switch applications such as power supplies, motor controllers and electronic ballast units for lights.


  • Primary rated current: 20 A max
  • Frequency range: 20–200 kHz
  • Mid-tapped versions are available
  • Fully encapsulated 

50 hertz

The TECH POWER ELECTRONICS GROUP are developing a new standard range of fully encapsulated current sensors with nanocrystalline cores. They are intended for power electronic applications which require high precision current measurement. In comparison to other soft magnetic materials, nanocrystalline alloys have proven themselves as better material for current transformers. Their use in toroidal cores guarantees low core loss due to a high permeability.

Hall effect sensors

We use our know-how to produce current sensors with the Hall effect at different sizes and with different powers. Current sensors equipped with the Hall effect are generally sensitive to temperatures making temperature compensation necessary. Very high currents – including short-term high input surge currents – can lead to the core material becoming magnetised. Measurement errors and/or zero offsets then result due to remanence.