Summation Current Transformers

General Details

Summation Current Transformers

Summation current transformers are used to add up secondary currents of multiple main current transformers in order to measure with one instrument only.

Summation current transformers output signal is again a standardized signal which is received by adding the input currents and divide the sum by the quantity of inputs.

A Current Transformer (CT) is a type of transformer that is used to reduce or multiply an alternating current (AC). It produces a current in its secondary which is proportional to the current in its primary.

Current Transformers, along with voltage or potential transformers, are instrument transformers. Instrument transformers scale the large values of current to small, standardized values that are easy to handle for measuring instruments and protective relays. The Instrument transformers isolate measurement or protection circuits from the high voltage of the primary system. These units provide a secondary current that is accurately proportional to the current flowing in its primary, presenting a negligible load to the primary circuit.

These units are the current sensing units of the power system and are used at generating stations, electrical substations, and in industrial and commercial electric power distribution.

Advantages of Current Transformers are that the units can measure high current easily, high electrical isolation, simple construction, and easy maintenance and installation.

The Crompton Instruments product range represents one of the largest product offerings of power measurement, control, and protection instrumentation, for switchgear and generator set manufacturers, panel builders and OEMs.

By combining local knowledge with over 100 years of research, product development and manufacturing capabilities, Crompton Instruments products provide the highest standards of performance and user convenience.


  • 190XSUM-2   (5+5:5)
  • 190XSUM-4   (5+5+5+5:5)
  • 190XSUM-5   (5+5+5+5+5:5)
  • 20XSUM-2    (5+5:5)
  • 20XSUM-3    (5+5+5:5)
  • 20XSUM-4    (5+5+5+5:5)
  • 20XSUM-5    (5+5+5+5+5:5)


  • Higher accuracy
  • Higher burden capacity
  • Higher efficiency
  • Insulation Level of 600V, 10kv BIL Full Wave, 50-500 Hz
  • No Window Type
  • Ratios from 2.5 to 100:5 amps ac



  • CSA
  • UL


Model 190XSUM-2

Model 190XSUM-2

  • CSA
  • UL