LV Systems

Current Transformer


A current transformer is defined as as an instrument transformer in which the secondary current is substantially proportional to the primary current

(under normal conditions of operation) and differs in phase from it by an angle which is approximately zero for an appropriate direction of the connections.

This highlights the accuracy requirement of the current transformer but also important is the isolating function, which means no matter what the system voltage the secondary circuit need be insulated only for a low voltage. Their role in electrical systems is of primary importance as they are a means of "stepping down" the current or voltage of a system to measurable values, such as 5A or 1A in the case of a current transformers


  • Rated primary current: 20 to 400 A
  • Rated secondary current: 5 or 1 A
  • Accuracy class: 0.5 / 1 / 3 / 5 or other for customer individual order
  • Security factor for apparatus: FS 5 or FS 10

WE dealing with fews companies like

  • KAPPA ELECTRICAL
  • ABB
  • SCHNEIDER
  • COOPER INDUSTRIES