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Current transformer for indoor application designed in accordance with the prescriptions of the DIN 42600-8 standard


General description

The support type current transformer is manufactured with a fully epoxi resin embedded core, produced of cold rolled grain orieated or amorf nanocristalic electrical steel, in a design with 1,2 or 3 secondary circuits, mounted on a coated metal baseplate. The current transformer is suitable for indoor application for rated  primary voltages from 3kV to 10 kV. That is for maximum system voltages from 3,6kV to 12 kV. For supplying the current circuits of relays and other instruments.

The primary terminals are located on the upper surface of the equipment. The size of the connecting bolts is M12.

The seconary windings are for measuring or for protective purposes and are manufactured in accuracy classes 0,2, 0,25, 0,5, 0,5S, 1 for measuring and in 5P 10P for protection.

The material of the primary and secondary windings as well as of the terminals is copper.

The current transformer is designed and manufactured to comply with the requirements of the effective Hungarian Standards MSZ EN 61869-1,-2, or EN6169-1,-3, the previous MSZ EN 60044-2, IEC 186 and also with DIN 42600-8. On the basis of common agreement it is possible to manufacture according to other standards, different from the aforementioned as well.


Packing, delivery

The current transformer is delivered in a finish suitable for use under normal climatic conditions, packed in corrugated paper boxes. Upon common agreement the delivery can be made in finish and packing suitable for the requsted climatic zone.


Installation, operation

The current transformer can be fixed with 4 pcs M10 bolts. The connection to the primary terminals is accomplished with M12 bolts. The secondary wires provided with cable lugs, can be fixed to the secondary terminals by the means of M5 bolts. The terminals are closed with a sealable plastic cover. The secondary terminals marked with „S2” can be earthed with M5 Bolts to the baseplate.

The M8 earthing bolt of the instrument is located on the side opposite to the secondary terminals.

The rating plate, sticked on the secondary side of the current tranformer contains both the technical parameters and the secondary markings. Besides the ratio, the primary and secondary terminals and the earthing are marked with labels. All the bolts and washers are coated.

Operation is possible keeping the prescriptions of the relevant security – labour – and property  – protection directives. Any faults and breakdowns emerging in the costumers sphere of interest due to breaching, disobeying the aforementioned, exempt the manufacturer from the warranty and quarantee lialibities.



The maintenance consists of works to be done according to the general rules for maintenance of indoor instrument and equipments. These are:

  • periodical inspection of contamination
  • cleaning depending on the degree of impurity
  • inspection of the surfaces
  • tightening the bolts of the primary and secondary connections
  • tightening the fastening and the earthing bolts.


State verification

The secondary windings of the current transformers in class 0,2, 0,2S, 05, 0,5S are manufactured in finish suitable for verification. The verification itself will be made only on special request. In this case it will be accomplished and documented by an official seal or an affixed verification stamp by the state office for measurement.

Data to be supplied with the order

  • type execution e.g. Change over possibility
  • rated insulation level
  • rated primary and secondary currents
  • rated thermal short time current and rated dinamic current
  • accuracy class and output of the secundary circuit
  • quantity
  • requested term of delivery


Other or special requirements

  • climate zone of use other than normal
  • language of the rating plate
  • packing
  • number of pieces and sort of the documentation requested


Warranty period, guarantee

The warranty period is 12 months. Upon mutual agreement of the parties it can be otherwise established.


Technical Data


Rated voltage (network) 50 Hz      3 kV      6 kV      10kV
Highest voltage for equipment    3,5kV   7,2 kV      12kV
Power frequency withstand voltage(EFF)(1MIN)     10kV    20 kV      28kV
Lightning impulse withstand voltage (peak)      20kV    60 kV    75 kV
Rated shorttime termal current 100xIn, -800xIn

de max. 50kA eff 1s

Rated dinamic current 2,5xIt

de max. 125 kA csúcs

Primary currents (A) normal execution



Execution with change over possibility


100,150, 200, 250, 300, 400, 500, 600, 750, 1000, 1250, 1500, 2000, 2500

2×5, 2×10, 2×15, 2×20, 2×25, 2×30, 2×40, 2×50, 2×60, 2×75, 2×100, 2×150, 2×200, 2×250, 2×300

Secondary current 5A , 1A
Accuracy classes, output 0,2-0,2S       2,5-30VA

0,5, 0,5S      2,5-45VA

1                   2,5-60VA

5P                 2,5-60VA

10P               2,5-60VA

Number of cores 1,2 ill.3
Insulation class B
Dimension (lxwxh mm) 375x148x220
Mass (kg) ~22


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