Smart Meter CT Guide

02/2011 2/2

The Fronius Smart Meter has technical requirements that need to be followed when choosing CT’s. The Smart

Meter is designed for measuring AC circuits only.

CT’s have what is commonly referred to as a primary and secondary side. The primary side is the circuit being

measured. The secondary side is the output from the windings on the CT and is measured in amps or volts. For the

Fronius Smart Meter, only CT’s with a voltage output of 0.333V on the secondary side may be used.

ATTENTION: CT’s with current output such as 1 Amp, 2 Amps and 5 Amps will destroy the meter and must not be

used.

Although any brand of CT that meet the technical requirements may be used, CT’s available from Continental

Control Systems have been specifically designed to work with the Fronius Smart Meter:

https://ctlsys.com/current_transformers

/ CT wire sizing chart

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