русский українська беларуская
Toroidal power transformers of power ranging from 1VA to 5kVA. Measuring current transformers TOP-N-0.66 and TSP-N-0.66. High-voltage ignition transformers and transformers for neon signs. Inductance coils (including coils for induction flow meters). Toroidal magnetic cores  from electric anisotropic steel.	Power supply transformers for low voltage halogen lamps from 20 VA to 600 VA. Matching and output transformers. Transformers and inductors for impulse and HF-devices. Audio transformers. Inductors.


Toroidal transformers Toroidal transformers


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Products of our company

Reference current transformers

Measuring current transformers are designed for large-scale conversion of alternating current for the purpose of its further measurement in networks with a frequency of 50 Hz and a rated voltage of up to 0.66 kV inclusive. Transformers are used in commercial metering schemes for electrical energy (current transformers for meters of active electrical energy) for settlements with consumers, as well as in metering and protection circuits.

Support current transformers TOP-N-0.66 are manufactured with accuracy class 0.2S for rated primary current 1, 5, 10, 15, 20, 30, 40, 50, 75, 80, 100, 150, 200, 300, 400A, rated secondary current 5A.

Measuring current transformer support TOP-N-0.66
Measuring current transformer support TOP-N-0.66
Passport of the current transformer TOP-N-0.66 Passport.
Measuring current transformer
reference TOP-N-0.66 PKFL 671211.001 PS.

Reference measuring current transformers TOP-N-0.66 are approved for use as measuring instruments in the following countries:

Certificate of type approval of measuring instruments Republic of Belarus
Certificate No. 10464 dated 06/28/2021
Registered in the State Register of Measuring Instruments under the number RB 03 13 4630 16.

Measuring current transformers TOP-N-0.66 are mounted on a standard metal rail 35 mm wide of a special profile TH35 (DIN rail 35x7.5).

Support current transformer TOP-N-0.66 in section
Support current transformer TOP-N-0.66 in section

Measuring current transformer TOP-N-0.66. Overall and installation dimensions.

Overall, installation, connection dimensions of the TOP-N-0.66 transformer

Current transformer typeDimensions, mm

of manufactured support measuring current transformers

Type and version of current transformerRated load power, VARated primary current, ARated secondary current, AAccuracy class
51, 5, 10, 15, 20, 25, 30, 40, 50, 60, 75, 80, 100, 150, 200, 250, 300, 40050.2S
0.2, 0.5, 1, 3, 5

  1. Calibration interval - 4 years.
  2. DIN rail mountable.
  3. Double contacts for connecting metering devices.

The magnetic cores of the TOP-N-0.66 reference measuring current transformers are made of nanocrystalline alloy and have the following advantages over current transformers on cores made of electrical steel:

  • resistance of metrological characteristics to direct current magnetization;
  • increased energy efficiency of custody transfer (lower losses) due to higher electrical resistance of the material and reduced losses due to magnetization reversal of the core;
  • long service life while maintaining metrological characteristics.

Magnetic core made of nanocrystalline alloy provides long-term stability of parameters for more than 25 years.

To buy a reference instrument transformer send us a request in a form convenient for you.

application, operation of measuring current transformers
main advantages
prospects and economic efficiency
technical requirements of the concern «Belenergo»