TT Series

Split-core current transformers for measuring AC current

TT Series – Split Core Current Transformers with Cable Output

The TT Series split‑core current transformers are engineered for accurate measurement of AC currents in applications where installation flexibility and compact integration are key requirements. Designed with air‑core current transformer technology, TT sensors ensure galvanic isolation between the primary and secondary circuits and are primarily intended for energy, smart grid, and automation applications.

Unlike the AT Series, TT current transformers are delivered with a 1‑meter cable output, simplifying installation in confined or remote measurement locations. They are available with 8 mm or 16 mm aperture diameters, allowing adaptation to different conductor sizes. 

The TT Series focuses on straightforward deployment and reliable AC current measurement in distributed monitoring systems where cable‑based connection is preferred.

TT – Features and benefits

TT smart grid automation current sensors

Main characteristics

  • Splitcore current transformer for nonintrusive current measurement
  • Available with 16 mm or 8 mm sensing aperture, offering flexibility for different conductor sizes
  • 1meter cable output, enabling flexible current sensor placement away from control electronics
  • Insulating plastic case recognized according to UL 94V0

Benefits

  • High total error and low phase shift, supporting accurate power calculations
  • High insulation between primary and secondary circuits
  • Compact and lightweight design
  • Costeffective and easy to deploy

Typical applications

In addition to general energy and automation use cases, the TT Series is particularly suited for:

  • Power meters: Current measurement for active power calculation
  • Energy submetering: Energy efficiency monitoring, consumption analysis, and cost allocation
  • Power quality monitoring
  • Distributed measurement systems, where cablebased connection simplifies installation

The TT Series is ideal when measurement points are dispersed and installation flexibility is a key requirement.

LEM TT – Download & Technical Characteristic

Product

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DocumentNominal valueSecondary Nominal SignalSupply Voltage rangeOp. Temperature
TT 50-SDDatasheet50 ACurrent16.66 mA-25 to 70°C
TT 100-SDDatasheet
3D
100 ACurrent33.33 mA-25 to 70°C

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