Current Transformers for Metering

Introduction to Metering Current Transformers

Measuring Current Transformers (CTs) are used with the measuring instruments to:

  1.  Isolate the instruments from the power circuits,
  2.  Standardise the instruments, usually at 5 amps or 1 amp.

The scale of the instrument (according to the CT ratio), then becomes the only non-standard feature of the instrument.

If you require more information on Measuring class, please refer to our guide -> PDF

To help explain some of the terminology we use for our range of current transformers, we have produced a terminology section for your assistance.

How to choose your CT?

It can be difficult to pick the right CT for your application (especially if you do not have technical background). 

Here are some things we will need to know before we can provide a quotation for you:

  • Ratio
    • Primary
    • Secondary
  • Burden
  • Accuracy Class
  • Type 
  • Application - indoor/outdoor
  • Limiting Dimensions - CT has to fit on a busbar or in switchgear  

If you are still unsure how to choose your CT get in touch with us on +44(0)1355 236 057 or or our live Chat!