Home > SEM One - Single-phase Modbus Energy Meter



The first of its kind


SEM One is economical, simple and accurate. Measuring consumptions has never been so cost effective.


The king of submetering


SEM One is ideal for submetering applications where energy savings, costs distribution and quality measurement are key factors of an installation. In short, energy efficiency.



Sometimes is better make it easy


SEM One reads 12 electrical parameters and no more, but you’ll have more than enough.





Bold complements


Split or closed core transformers. You choose.


I want it




SEM One is a single-phase power analyzer that allows to monitor electrical parameters of your installation including energy, voltage, current, power and more. The design, of compact dimensions, allows that SEM One can be placed easily at any installation.

The devices has removal connectors for power supply (85-265 Vac), external current transformers (250 mA output) and RS-485 communications.

The communication of measured data works over Modbus RTU standard protocol.



  • RS-485 slave
  • Modbus RTU protocol
  • Remote configuration
  • Status LEDs
  • Manual reset
  • Compact dimensions. 1 DIN rail module
  • 230 Vac input voltage
  • PC self-extinguishing box

Single-phase split-core transformers

TRA1 80A

  • Maximum current 80 A
  • Secondary 250 mA
  • Inner diameter 10 mm
  • Class 1%

TRA1 100A

  • Maximum current 100 A
  • Secondary 250 mA
  • Inner diameter 15 mm
  • Class 1%

Single-phase closed core transformers

TRC1 100A

  • Maximum current 100 A
  • Secondary 250 mA
  • Inner diameter 12 mm
  • Class 0.5%

TRC1 250A

  • Maximum current 250 A
  • Secondary 250 mA
  • Inner diameter 20 mm
  • Class 0.5%



Manual SEM One Download


User manual SEM One (Multilanguage)  Download


Manual TRA Transformers  Download


Manual TRC Transformers  Download




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