Current Transformers and Rogowski Coils

Enhance your metering solutions

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Accurately measure high currents with our reliable and compact metering solutions for alternating current, designed to optimize both time and space efficiency.

When the current in a circuit is too high for direct measurement, our advanced current transformers and Rogowski coils effectively reduce the current to a safe, accurately proportional level. These solutions can be conveniently connected to measuring and recording instruments, ensuring seamless data acquisition.

Explore our full range to discover the most suitable Current Transformers or Rogowski coils tailored to your specific needs.

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Technical documentation and support

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measure
Accurate and reliable measurement

Class 1 & Class 0.5 accuracy, especially for low primary current transformers and reliable measurement according to IEC 61869-2 standard.

speed
Easy & time-saving navigation

Small number of order codes covering a broad range of primary currents from 50 A to 6000 A, supporting multiple connection methods such as DIN rail, cable, busbar, and base mounted with feet.

space saving
Compact installation without downtime

Space-saving design to minimize the overall dimensions of the panel. Split-core Current Transformers and Rogowski Coils perfectly fit existing installations with zero downtime – ideal for critical power applications.

wide range
Complete offering for all metering needs

Suitable for new and existing installations – from solid- and split-core current transformers to energy meters, Rogowski coils, DIN-rail transformers, and more.

Product range

 TRF_192x96Rogowski-Coils_192x96
 CTA Current TransformersCT1M Solid-core Current TransformersCT1M-S Split-core Current TransformersCT1M-C Split-core Current TransformersTRF M Modular Current TransformerRogowski Coils
TypeWounded primarySolid-core through primarySplit-core through primarySplit-core through primaryModularSplit core / Rogowski
Primary current [A]20 A to 100 A50 A to 6000 A100 A to 1500 A100 A to 300 A40 A to 600 AUp to 1000 A
Standard secondary current [A]5 A5 A5 A5A 5 APre-wired terminals directly fitting M4M inputs

 

FAQ

Can the incorrect installation of the current transformer affect the measurement of the connected device?

Certainly! Reversal of the connections to the CT’s secondary terminals or the wrong insertion of the primary cable can cause an incorrect measurement readings from the instrument. If one of the above situations occurs, the instrument measures a secondary current on its terminals that flows in the opposite direction of what actually happens.

Is it necessary to earth the secondary terminals of the current transformer?

Earthing the secondary terminals of current transformers provides a reference towards earth in case of transformer failure and prevents dangers for persons or risks of damage for the device installed in the switchboard.

In practical terms, how does the accuracy of an energy meter and the respective current transformer affect the measuring chain, energy saving and efficiency evaluations?

To evaluate the accuracy of a metering unit composed by a network analyzer or energy meter, and current transformers, the propagation of error and its incidence on the final measure can be calculated with the following formula:

 

 

 

What is the accuracy of M4M together with Rogowski?

The measurement system made of “M4M Rogowski version + R4M coils” is tested and certified as Class 0,5 acc. to IEC 61557-12. Accuracy is referred to measurement range 100A – 12kA with proper installation (cable at the center of R4M coil).

What is the cable length between R4M Rogowski coil and M4M?

The cable connecting the R4M Rogowski coil and the M4M Rogowski version is 3 meters long.

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