Auf unserer Webseite sind externe Links mit dem Symbol gekennzeichnet.
Language DE

This website uses cookies

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners who may combine it with other information that you’ve provided to them or that they’ve collected from your use of their services.

You can at any time change or withdraw your consent from the Cookie Declaration on our website.

Learn more about who we are, how you can contact us and how we process personal data in our Privacy Policy.

Allow all Show details Settings Deny all

legal notice | Privacy notice | cookie notice

Metering and Power Management

EFEN Metering and Power Management

Energy efficiency through measuring and monitoring

Measuring power parameters such as current, voltage and harmonics is a core competence of EFEN. This includes a comprehensive range of window- and tube-type current transformers. The range of high-grade devices in all rating classes allows complete installations to be equipped with components of one single system. For specific requirements, EFEN also offers a comprehensive range of wound primary current transformers, summation current transformers and transformers for NH fuse-links. EFEN’s current transformer blocks are easily and quickly integrated into E3 fuse-switches.
The integrated solutions from EFEN for electronic fuse monitoring offer convenient monitoring functions when plants need to be retrofitted.

Window-type and tube-type current transformers

EFEN offers a full range of window-type current transformers for primary currents up to 5,000 Amps as well as tube-type current transformers up to 600 Amps for line measuring or for NH fuse-switches. Current transformers are also available as PTB-compliant variants for billing purposes in accordance with the German Act on the Reorganization of Statutory Metrology and its adjustment to European legislation.
EFEN therefore has been offering PTB-compliant low-voltage current transformers according to module D or F since 2015.

» Online Shop

Special-purpose current transformers

For specific applications, EFEN has in store a great number of special-purpose current transformers. If you wish to achieve higher classes and performance levels at low ratios with window-type current transformers, we recommend the wound primary current transformers PSW 55 and PSW 70. Both comply with VDE 0414 T44-1 and IEC/EN 600-44-1.
Using EFEN summation current transformers of the PSS 2 and PGSU series allows up to ten supply outlets to be bundled into one power metering unit. Window-type and low-voltage current transformers for NH fuse-links complement EFEN’s system.

» Online Shop

Transformer blocks for E³-NH vertical design NH Fuse-Switches

The low-voltage current transformer blocks for E³ NH fuse-switches impress with both their features and performance characteristics. Thanks to their compact design, sizes 1 to 3 fit perfectly into the corresponding device openings. For secure contact, they are quickly and directly bolted to the output rails of E³ NH fuse-switches. This ensures accurate measuring results. Integrated 4-mm2 box clamps make sure that the secondary lines are properly connected. The E³ current transformer blocks in sizes 1 to 3 are available for all standard current levels.

» Online Shop


Plant availability is a prerequisite for production, growth and economic efficiency. Downtimes must be reduced to a minimum – no matter if power distribution grids, industrial plants or sources of renewable energy are concerned. Here, EFEN’s electronic fuse monitoring (ESÜ) offers a high level of transparency. Tripped fuses are immediately detected, allowing suitable remedial action right away. An end-to-end system for E³ NH fuse-switches with identical component width makes retrofitting existing installations quick and easy.

» Online Shop