AC Miniature Current Transformer

AC Miniature Current Transformer
AC Miniature Current Transformer
AC Miniature Current Transformer

A miniature current transformer, or mini CT, plays an important role in the current sensing modules or electrical protective devices. It provides safe galvanic seperation in circuit, thus very suitable for applications of high dynamic range. Xianyu’s miniature current transformers have high linearity and low phase error, based on the high permeability nanocrystalline cores. Busbar type miniature current transformers can be easily assembled by screwing. We can provide built-in or removable busbar type CTs. We provide different encapsulations, from plastic case to insulation tape wraping. And the turns ratio range from 1:1000 to 1:25,000. Besides that, DC immune type current transformers are also available, in which composite cores are used.


  • A variety of encapsulations
  • High linearity over the whole current range
  • High permeability nanocrystalline core inside
  • Accuracy up to 0.05 or 0.1 class, low phase error
  • Quick prototype development and sampling
  • Customized current transformer of wide-range current
  • Meet the standard IEC 62053, JB/T10665


  • Electrical measuring instruments
  • Electrical protective devices
  • Smart metering in electricity distribution
  • Current sensing modules
  • Power monitoring


DescriptionMiniature Current Transformer
Structure Of WindingToroidal
PhaseSingle, Three
Input / Output10~600A/1~40mA
Max. Current10~600 A
Turns Ratio (typical)1:1000, 1:2000, 1:2500, 1:5000
Burden (Rb)5~100 Ω
Accuracy Class0.05/0.1/0.2 Class
Core InsideHigh Permeability Nanocrystalline Core
EncapsulationPlastic Case, Metal Shield, Double Insulation
Busbar TypeBuilt-in / Removable Busbar
Mounting MethodScrew Fixing, Metal Clamp, Through Hole
ApplicationMeters, Instruments
Accept CustomizedYes
  1. Accuracy 0.1 Class, very low phase error, high linearity over the whole current range
  2. Plastic box with epoxy resin vacuum potting or double insulation tape wrapped properly
  3. Through-hole type, easy to fix and install
  4. We produce the critical parts ourselves, accept ODM / OEM, and provide free samples.
  5. Meet the requirements of standard IEC 62053, GB17201, JB/T10665
  6. Used for Electrical measuring instruments, electrical protective devices, current sensing modules, and so on.