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Current Transformers

IP Current Transformers

Key Features

  • From +-1 mA to +-5 A factory preset
  • Increased sensitivity with multiple primary turns
  • +-10 V analog output
  • Flat response from DC to 4 kHz
  • 10 µA rms resolution on any range
  • Large aperture 69 mm (2.7”)
  • Accuracy independent of primary conductor position
  • Withstands high overload and inrush currents


IPCT works on the principle of the DCCT, invented at CERN, the European Particle Physics Laboratory, by K.Unser in 1969. The DC component of the current flowing through the toroid sensor is detected by a magnetic modulator, also called fluxgate or second-harmonic detector.
The AC component is detected by an active Hereward transformer. The two circuits are cascaded in a common feedback loop to generate a magnetic flux which always cancels the primary current flux. IPCT output is the voltage developed by the feedback current passing through a precision resistor.



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