Epoxy-Cast Window-Type Current Transformers for Indoor Application, 3kV

Medium-Voltage Current Transformers (3~7.2 kV)


About the Product

Insulated with Araldite® epoxy resin and designed for indoor use, these window-type current transformers are suited for the main panel or motor control panel of a medium-voltage (≦ 3.6 kV) power system. Good for protection and appropriate for measuring and monitoring instruments, these current transformers are available in both 2-core and single-core models. The window-type design facilitates installation and wiring with a busbar or insulated cables, which decreases the occurrence rate of contact point failure. The CR-3S Series current transformers are characterized by a high degree of moisture resistance, as well as superior physical and electrical properties.


  • Standards: IEC or IEEE
  • Two-core & single-core models
  • Indoor usage
  • Epoxy cast (Araldite® epoxy resin)
  • Rated Voltage: ≦ 3.6 kV
  • Frequency: 50/60 Hz
  • AC/BIL: 10/40 kV
  • Other specifications upon request

Selection Table

Other standards and specifications available.

* Window diameter varies according to models


Available Models

CR-3S-30, CR-3S-60, CR-3S-70, CR-3S-90, CR-3S-45A, CR-3S-60A, CR-3S-75A, CR-3S-130A, CR-3S-90B , CR-3S-140B



CR-3S Series Medium-Voltage Epoxy-Cast Current Transformers for Indoor Use (Window-Type)

Easy-to-print document, containing product description, specifications, and a selection table.

CT & PT Selection Guide: How to Choose a Current Transformer or Potential Transformer

How to select, based on application and power system attributes, the primary and secondary currents, burden, accuracy, rated frequency, type (indoor vs. outdoor), insulation material, etc.